Question

a body of mass 2 kg is moving on a horizontal surface with an initial velocity of 4m/s comes to rest after 2s. if one wants to keep this body moving on the same surface with 4m/s, the force required is

Answer 1

U=4m/s
V=0
M=2kg
T=2s
A=?
A=v-u/t
=0-4/2=-2m/s-2
F=m×a
F=2×(-2)
F=-4N