Question

A body of mass 5kg falls freely from a height 100m.Find it's
•Potential energy
•Kinetic energy and potential energy after 3sec.

Answer 1

potential energy = mgh

5kg x 10 m per sec.sq x 100m

5000 joule

kinetic and potential energy after 3 sec
1/2mv^2
1/2x 5 x 30 x30 ...by 1 eq.
2250 joule
and in potenlial energy height will decrease
so
by 3nd eq....
mgh
5 x 10 x 98.5
4925 joule