Question

what are the needs of newton's laws of motion

Answer 1

to derive net acting force on a body which has acceleration and some mass

Answer 2

Hey___________________________________
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Here are the reasons why Newton’s Laws of Motion is important:

°They form the most intuitively appealing physical theory.

°They represent mankind’s first great success at describing diverse aspects of nature with simple mathematical formulas.

°These laws actually work.

°They lay the groundwork for later physics developments.