Question

Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown. Calculate the frictional force of the floor on the ball.

• A. 50 N
• B. 0.5 N
• C. 5000 N
• D. 80 N

Answer 1

The correct option is B

0.5 N

Acceleration, a = $\frac{v-u}{t}=\frac{-80}{8}m{s}^{-2}=-10m{s}^{-2}$

Force, F = ma = $\frac{50}{1000}\times 10=0.5N$