Question

A force $F$ acts on the ball of mass 2 kg and it changes the speed from 4 m/s to 8 m/s in 0.5 seconds. Calculate force $F$.

• A. 2 N
• B. 4 N
• C. 8 N
• D. 12 N
• E. 16 N

Answer 1

The correct option is E 16 N

Acceleration, $a=\frac{dv}{dt}=\frac{8-4}{0.5}=8m/s^2$

Using Newton's second law, force $F=ma=2\times 8=16N$