A body having a mass 100 gram is allowed to fall freely from a height 100 g under the action of gravity. Its kinetic energy after 4 seconds be (take g - 10 m/s2)
Given,
Initial velocity, u=0
Time, t=4sec
Apply equation of kinematic.
V=u+gt
V=0+10×4=40ms−1
Kinetic energy,K.E=12mV2=12×0.1×402=80J
Hence, kinetic energy is 80J