Question

Work
(18) A body of mass 5 kg is moving with a
momentum of 10 kg ms. A force of 0.2 N acts
on it in the direction of motion of the body for
10 seconds. The increase in its kinetic energy is:
(a) 2.8 J
(b) 3.2 J
(C) 3.8)
(d) 4.4 J​

Answer 1

Answer:

Answer is d)   4.4  J

Answer 2

Answer:

initial kinetic energy is P^2/2m= 100/10=10J

v=u +at=2+0.4=2.4

ke=2.4×2.4×5×0.5=14.4J

change is 4.4J