Question

a body of mass 6kg moving forward on horizontal surface with an initial velocity of 8m/s comes to rest after 3s. if one wants to keep this body moving on the same surface with velocity of 8m/s, the force required is​

Answer 1

Answer: No force is required to keep the mass moving at a constant velocity (on a frictionless surface) and in the same direction

Step-by-step explanation:

Tricky question!

The force required to slow the moving mass down to a rest is F = ma

F = (6 kg) x ((0 - 8m/s)/(3 s)) = 16 N (force in opposite direction of motion)

To keep the 6 kg mass which is already moving at a velocity of 8 m/s going in the same direction at the same velocity, no force (F=0) is applied, due to Newton's 1st Law of Motion. This assumes a frictionless surface.