1.

Which one of the following statements is true concerning the motion of an ideal projectile launched at an angle of 45^(@) to the horizontal ?

Answer»

The speed at the top of the trajectory is zero.
The OBJECT's total speed remains constant during the entire flight.
The horizontal speed decreases on the way up an increases on the way down.
The vertical speed decreases on the way up and increases on the way down.

Solution :SINCE the ACCELERATION of the projectile is always downward (because it's gravitational acceleration),the vertical speed decreases as the projectile rises and increases as the projectile FALLS. Choice (A) is false because gravity always points down. Choice (B) is false because the projectile still has its horizontal velocity at the top of the trajectory. Choice (C ) is false because the vertical component of the velocity changes, even if the horizontal component does not, so the total speed changes.


Discussion

No Comment Found

Related InterviewSolutions