Question

A body of mass 5 kg is moving with a velocity of 20 m/s is brought to rest ay a constant force 100 N. What is the displacement and KE of the body?

a)20 m,1000J

b)10m,1000 W

c)40m, 2000 J

d)100 m,2000 W

Answer 1

Given,

m=5kg

u=20m/s

F=100N

t=10s

Force, F=ma

a=mF

a=5100m/s2

a=20m/s2

From 1st equation of motion,

v=u+at

v=20+20×10

v=20+200

v=220m/s