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  4. If the initial velocity of a body is V1 and final velocity is V2 and the angle between V1 and V1 is φ then the change in velocity is.

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Q. If the initial velocity of a body is $V_1$ and final velocity is $V_2$ and the angle between $V_1$ and $V_1$ is $\phi$ then the change in velocity is.

Motion in a Plane

Solution:

Correct answer is (c) $\sqrt{V_1^2+V_2^2-2V_1V_2\,\cos\,\phi}$