Question

Q50) If Fis the only force acting on the system is called a ?
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Answer 1

Explanation:

According to Newton's second law :F=∆P/∆t, where ∆P is the change in linear momentum and ∆t is change in time

When F=0, ∆P=0.

So when the force acting on the system is zero ,linear momentum is not changing or it is a constant.