Question

A body moving along a straight line at 20 M/s undergoes an acceleration of 4m/s^2 what is its speed after 2 second?

Answer 1

initial speed (u)=20

final speeed(v)=v

a=4

using first law of motion

v=u+at

v=20+4x2

v=28m/s

speed will be 28m/s