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

So 5*10*100=5000 j

Answer 2

kinetic E

v²=u²+2as

v=√(u²+2as)

v=√(0+2*g*10)

v=√20gms⁻¹

k.e=¹/₂.mv²

k.e=¹/₂.20.20g

k.e=200gj

p.e=mgh

p.e=20.g.10

p.e=200gj