A ball of mass 100 g is moving with a velocity of 3 m/s towards east. A cube of mass 200 gram is moving towards west with a velocity of 7 m/s. If the collision is perfectly elastic, what is the final velocity of the cube in m/s?(a) 7(b) 5(c) 3(d) 11The question was posed to me by my school principal while I was bunking the class.Origin of the question is Collision topic in division Work, Energy and Power of Physics – Class 11

A ball of mass 100 g is moving with a velocity of 3 m/s towards east.

1.	A ball of mass 100 g is moving with a velocity of 3 m/s towards east. A cube of mass 200 gram is moving towards west with a velocity of 7 m/s. If the collision is perfectly elastic, what is the final velocity of the cube in m/s?(a) 7(b) 5(c) 3(d) 11The question was posed to me by my school principal while I was bunking the class.Origin of the question is Collision topic in division Work, Energy and Power of Physics – Class 11
Answer» Right choice is (a) 7 To explain: The INITIAL momentum of the system = momentum of ball + momentum of cube = 1100 Kg-m/s eastwards. Since the momentum is CONSERVED, the initial momentum = final momentum. Hence the final momentum is 1100 Kg-m/s eastwards. The collision is perfectly ELASTIC, therefore, e = 1. Therefore, final relative VELOCITY (of cube with respect to ball) = initial relative velocity (of cube with respect to ball). Difference in the final velocities of cube and ball = 4 m/s. From this information and the CONSERVATION of momentum, one can find the final velocity of the cube.

Discussion

No Comment Found

Related InterviewSolutions

The energy possessed by an object because of its motion is termed _____(a) potential energy(b) kinetic energy(c) nuclear energy(d) solar energyI have been asked this question in semester exam.I'm obligated to ask this question of Various Forms of Energy : The Law of Conservation of Energy topic in section Work, Energy and Power of Physics – Class 11
Since the potential energy of an object depends on the acceleration due to gravity and since the acceleration due to gravity decreases as altitude increases, we can conclude that the potential energy of an object decreases as altitude increases.(a) True(b) FalseI got this question by my college professor while I was bunking the class.My doubt is from Potential Energy in division Work, Energy and Power of Physics – Class 11
Which of the following statements are true?(a) Energy can be created and destroyed(b) Energy cannot be created but only destroyed(c) Energy cannot be destroyed but only created(d) Energy can neither be created nor destroyedI got this question by my college director while I was bunking the class.I want to ask this question from Various Forms of Energy : The Law of Conservation of Energy in portion Work, Energy and Power of Physics – Class 11
A force of 40 N acts on body of mass 5 Kg. What is the amount of work done if the total displacement is 2 m and is in the direction of the force applied?(a) 80 J(b) -80 J(c) 40 J(d) 16 JThe question was posed to me by my school teacher while I was bunking the class.My question is taken from Work in section Work, Energy and Power of Physics – Class 11
The work done by a body while covering a vertical height of 5m is 50 kJ. By how much amount has the energy of the body changed?(a) 50 kJ(b) -50 kJ(c) 25 kJ(d) 10 kJThis question was addressed to me by my school principal while I was bunking the class.I need to ask this question from Work-Energy Theorem topic in portion Work, Energy and Power of Physics – Class 11
The energy possessed by a body by the virtue of its motion is called ______(a) Kinetic energy(b) Potential energy(c) Total energy(d) Motion energyI got this question in semester exam.I'm obligated to ask this question of Introduction to Work, Energy and Power topic in portion Work, Energy and Power of Physics – Class 11
A motor is used to pump water from a depth of 5 m to fill a volume of 10 cubic meters in 5 minutes. If 50% of the power is wasted, what is the power of the motor? (Assume g = 10m/s^2)(a) 1000/3 W(b) 3000/3 W(c) 5000/3 W(d) 10000/3 WI got this question in exam.The doubt is from Power topic in portion Work, Energy and Power of Physics – Class 11
The law of conservation of energy is not applicable to mechanical systems as they require energy input to keep working.(a) True(b) FalseThe question was posed to me in class test.This intriguing question originated from Various Forms of Energy : The Law of Conservation of Energy in division Work, Energy and Power of Physics – Class 11
The potential energy possessed by a spring is also known as _____(a) Elastic potential energy(b) Extensive potential energy(c) Compressive potential energy(d) Deflection potential energyThis question was addressed to me during an internship interview.My question is taken from The Potential Energy of a Spring in chapter Work, Energy and Power of Physics – Class 11
If a solid sphere of mass 200g and radius 20cm is rotating with an angular velocity of 5 rad s^-1, its rotational kinetic energy is _____(a) 0.06J(b) 0.04J(c) 0.03J(d) 0.004JThis question was addressed to me in exam.This intriguing question originated from Kinetic Energy in portion Work, Energy and Power of Physics – Class 11

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment