Question

A body of mass 2 kg is moving with a velocity 8 m/s on a smooth surface. If it is to be brought to rest in 4 seconds, then the force to be applied is

• A. 8 N
• B. 4 N
• C. 2 N
• D. 1 N

Answer 1

Answer: (B)

4 N

Answer 2

$F = ma = \frac{m(u - v)}{t} = \frac{2 \times (8 - 0)}{4} = 4N$