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  4. A ball of mass text0.2 kg moves with a velocity of 20ms- 1 and stops in 0.1s , then the force on the ball is

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Q. A ball of mass $\text{0.2} \, kg$ moves with a velocity of $20ms^{- 1}$ and stops in $0.1s$ , then the force on the ball is

NTA AbhyasNTA Abhyas 2022

Solution:

Newton's second law states that the rate of change of momentum of a body is equal to the force applied.
So, $F=ma=\frac{m \Delta v}{\Delta t}$
$\Rightarrow F=\frac{0 .2 \times 20}{0 .1}=40 \, N$