The velocity time graph of a ball of mass $20 g$ moving along a straight line on a level ground is given below. How much force does the ground exert in the ball to bring it to rest?

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Solution

Mass of the body, $m = 20 g = 0.02 k g$
From the given graph, we note that
Initial velocity, $u = 20 m / s = 20 m / s$
Final velocity, $v = 0 m / s$
Time taken, $t = 10 - 0 = 10 s$
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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The velocity time graph of a ball of mass 20g moving along a straight line on a level ground is given below. How much force does the ground exert in the ball to bring it to rest?

The velocity time graph of a ball of mass $20 g$ moving along a straight line on a level ground is given below. How much force does the ground exert in the ball to bring it to rest?