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Second Law of Motion

A ball of mas...

Question

A ball of mass $0.2 k g$ moves with a velocity of $20 m / s$ and it stops in $0.1 s$ , then the force on the ball is

A

40 N

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B

20 N

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C

4 N

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D

2 N

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Solution

The correct option is B $40 N$
$F = m a = m (\frac{υ - u}{t}) = \frac{- m u}{t}$
Substituting the values and neglecting the negative sign (because none of the options is negative)
$F = \frac{0.2 \times 20}{0.1} = 40$ N

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