Question

b) A body is moving along a straight line at 20ms–1 under goes an acceleration of 4ms–1 after 2s, its speed will be?

Answer 1

by equation of motion
v=u+at
v=20+4×2
v=28

Answer 2

initial velocity=20m/s

acceleration=4ms-2

time=2s

therefore..

v=u+at

v=20+4*2=28