4.A body having an initial velocity of 10m/s acquires a velocity 20m/s in 2s.The acceleration of the body is

Given information,

u=10m/s

v=20m/s

t=2s

v=u + at

20=10+2a

20-10=2a

10=2a

a=5 m/s2

The acceleration of the body is 5m/s2