Question

25. (a) Certain force acting on a 20 kg mass changes its velocity from 5 m sto 2ms!
Calculate the work done by the force.

Answer 1

Answer:

ANSWER

Given :          Initial velocity     u=5  ms−1

                      Final velocity     v=2  ms−1

From work-energy theorem,            

W=ΔK.E

W=21mv2−21mu2

W=21×20×22−21×20×52

⟹W=−210 J