Question

Velocity versus time graph of a ball of mass 30 g rolling on a concrete floor is shown in the figure below. What will be the frictional force of the floor on the ball?​

Answer 1

Answer:

Acceleration =−10ms

−2

, Force=0.5N

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.