Question

A man drops a 10 kg rock from the top of a 5 m ladder.What is its kinetic energy when it reaches the ground?What is its speed just before it hits the ground?

Answer 1

mass=10kg
height=5
since kinetic energy=potential energy
So
k.e.=mgh
=10(9.8)(5)=490j
from eqn 1
mgh=1/2mv2
=v2=2(10)(5)
=v2=100
v=√100
v=10m/s

Answer 2

✨Hey✨

Refer to the attachment!!