Question

A child drops a stone of 1kg from the top of a tower . Find its kinitic energy , 5 sec after it starts falling ? (G=10m/s²)

Answer 1

Explanation:

mass : 1kg

time : 5 sec.

g/acceleration : 10m/s^2

initial velocity/u : 0m/s

according to first law of motion

v = u + at

v = 0+10×5

v = 50m/s

now,

kinetic energy = 1/2mv^2

= 1/2×1×50×50

= 1250J