1.

a body of mass 5 kg intially at rest is subjected to a force of 20 n . how much kinetic energy is acquired by the body at the end of 10 sec

Answer»

Initial Velocity = u = 0
Time = 10 s
MASS= 5kg
Acceleration= a
Force = mass * acceleration = 20N

5 * a = 20
a = 4 m/s^2

Final velocity = V = u + a*t
= 0 + 4 * 10
= 40m/s

Final KE= 1/2 m*v*v = 1/2 * 5 * 40 * 40 = 4000J



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