A horizontal force is applied to a 2-kg ball on a smooth table.?

Question

The ball's speed is 8 m/s when it has gone 4 m. The magnitude of the force is?

A. 16N

B. 1.6 N

C. 8 N

D. 2 N

Answer 1

A.16N

I agree with "college physics" above

8 m/s after 1 second with distance travelled 4m.

Answer 2

F=ma, x=1/2 at^2, 8=2at,so axt=8, 4=1/2atxt=1/2x8xt so t=1sec and a=8m/sec^2 then F=2kgx8=16 newtons.

              Force=16 N