Question

Deduce Newton’s first law from the second law.

  • Force and laws of motion CBSE Class 9
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Answer

According to second law, F = ma

If F = 0, a = 0 since m ≠ 0,

But a = {v – u \over t}

or, v – u = 0   so, v = u for whatever time t is taken.

This means that the object will continue moving with uniform velocity, u throughout the time, t. If u is zero then v will also be zero. That is, the object will remain at rest.

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