Question

Q76. 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

Answer:

We know that Acceleration a=

t

v−u

=

8−0

0−80

=−10ms

−2

Now, Force=ma

m=50g=

1000

50

kg

So, F=ma=

1000

50

×10=0.5N

frictional force oppose the motion, so it is taken as positive with direction opposote to velocity.