Velocity versus time graph of a ball of mass 50g rolling on a concrete floor is shown above. Calculate the acceleration and the frictional force of the floor on the ball?
A
Acceleration =−10ms−2 , Force=500N
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B
Acceleration =0ms−2 , Force=0N
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C
Acceleration =−10ms−2 , Force=0.5N
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D
Acceleration =−1ms−2 , Force=50N
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Solution
The correct option is C Acceleration =−10ms−2 , Force=0.5N
We know that Acceleration a=v−ut=0−808−0=−10ms−2
Now, Force=ma
m=50g=501000kg
So, F=ma=501000×10=0.5N
frictional force oppose the motion, so it is taken as positive with direction opposote to velocity.