Question

A body of mass 2 kg is moving with momentum 4 kg m/s. A force of 2 N acts on it in the direction of motion for 5 s. The increase in kinetic energy is

as fast as possible​

Answer 1

Answer:

t=5s

p=mv

4=2×v

v=2m/s

as F=2N

a=2/2m/s²= 1m/s²

KE=1/2mv²

KEi=4J

now ,t=5s

v f =u+at

vf=g+1×5

=5m/s²

KEf=1/2×2×5

KEf=5J

△KE=5-4

=1J