The velocity- time graph of a ball of mass 0.2 gram moving along a straight line on a table is given in the graph, find [a] acceleration on the ball [b] the force the table exerts on the ball to bring it to rest [c] how long it takes for the ball to come to rest?
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Answer:
0.04n
Explanation:
Mass of the body, m=20 g=0.02 kg
From the given graph, we note that
Initial velocity, u=20 m/s=20 m/s
Final velocity, v=0 m/s
Time taken, t=10−0=10s
The force exerted on the ball is,
F=m x a
F=m x (v−u)/t
F=−0.04 N
The negative sign shows that the friction force exerted by the table is opposite to the direction of motion of the ball.
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