Question

Velocity versus time graph of a ball rolling on a concrete floor is shown in the figure below. i) Find the displacement of the ball ii)What is the velocity of the ball after 8s? iii)Name the unbalanced force acted on the ball

Answer 1

Explanation:

Correct option is

C

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.