Question

A vehicle of mass 20kg is moving
with a velocity of 4ms-1. Find the magnitude of force that is to be applied on vehicle so that the vehicle have a velocity of 1ms-2 after travelling a distance of 20m

Answer 1

If we have to find force we would have to find out the acceleration first. Because F=m×a

By v^2=u^2 + 2as............(s=distance)

1^2= 4^2 + 2×a×20

1=16+40a

a= -2/5

Now as we have got a

Let's find out force i.e. F=ma

F = 20 × -2/5

F = -8 newton

Hence force is -8 newton

Hope this helps you.