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Question

State the relation between force and acceleration.
How much force acts on a body whose momentum remains constant.

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Solution

Newton's second law shows that there is a direct relationship between force and acceleration. It states that "Force acting on a body is equal to the product of its mass and acceleration"
or, F = m a

We know that force acting on a body is equal to change in moementum per unit time (from Newton's second law)
Thus, when the momentum of a body remains constant force acting on it will be zero.
i.e.
F = 0 , when momentum remains constant.

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