Question

what will be the spped of a body which moves along a straight line at 20m/s undergoes an acceleration of 4m/s after 2 sec

Answer 1

speed = distance/time

initial speed - 20  m/s

v = u+at
v = 20 + 4*2
v = 28m/s

s = ut + 1/2 at²
s= 20*2 + 1/2 *4*2²
s= 40+8
s= 48m

speed = d/t
48/2
=24 m/s