Question

22. A body of mass 2 kg is projected vertically
up with a velocity of 100 ms. If it rises to a
height of 400 m, the energy utilized to
overcome friction is
(g = 10 ms-)
1) 10 KJ 2) 8 KJ 3) 1 KJ 4) 2 KJ

Answer 1

Answer:2kj

Explanation: maximum height the body can reach with u= 100m/s will be 500m (using hmax= u^2/2g )

But height reached=400m

The amount of energy required to move that 100m was utilised to overcome friction

E= mgh= 2×10× 100= 2kj

Answer 2

Answer:

answer. is. 2kj bye bye