Question

A body of mass 5 kg falls freely from a height 100 m. Find its1. potential energy,2. kinetic energy after 3s.​

Answer 1

mass of the object is 5 kg

height is 100m

g=10m/s (square)

potential energy = mgh

5×10×100

=5000J

kinetic energy = 1/2mv (square)

initial velocity =0

final velocity=?

time=3s

acceleration=v-u/t

acceleration is due to gravity

therefore,10=v-0/3

v=30m/s

kinetic energy is 2250J

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Answer 2

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