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CBSE Class 9 Answered

derivation of laws
Asked by | 29 Jul, 2008, 04:46: PM
answered-by-expert Expert Answer

We cannot entertain multiple question of this type, please post each question individually and let us know where you are getting stuck so that we would be able to explain things better.

Second law mathematically .,

F = ma

now F= 0  ( 1st law implies in absence of external force )

so , m a = 0

but  mass cannot be zero ; so acceleration is zero which is possible only under foll. two conditions:

(i) body is at rest

(ii) body is in uniform motion

which establishes , Newton's 1st law of motion : A body continues in the state of rest or of uniform motion in a straight line until acted uponby an external force.

Answered by | 30 Jul, 2008, 01:23: AM

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