Question

Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in Fig. 9.1. Calculate the acceleration and frictional force of the floor on the ball.

Answer 1

From the given velocity − time graph,  acceleration of the bll,

a = `("Change in velocity")/("Change in time")`

= `(0 - 80)/(8 - 0) "ms"^-2`

= −10 ms⁻² 

Frictional force of the floor o the ball = m

= (0.05 × 10) N (∵ m = 50g = 0.05 kg)

= 0.5 N