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# CBSE Class 9 Answered

I DID NOT UNDERSTOOD THE SECOND & THIRD EQUATION OF MOTION.Pls Help.
Asked by dencyk | 18 May, 2010, 04:01: PM

Dear student,

Please go through this derivation, if you are still with more doubts, please get back to us.

Second equation of motion:

From equations (1) and (2)

The first equation of motion is v = u + at.

Substituting the value of v in equation (3), we get

3rd equation of motion:

The first equation of motion is v = u + at.

v - u = at ... (1)

From equation (2) and equation (3) we get,

Multiplying equation (1) and equation (4) we get,

(v - u) (v + u) = 2aS

[We make use of the identity a2 - b2 = (a + b) (a - b)]

v2 - u2 = 2aS

Hope this helps.

Team

Topperlearning.com

Answered by | 19 May, 2010, 12:52: PM

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