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  4. A particle is projected with velocity u inclined at an angle α with x-axis. Change in velocity of the particle on return to ground is

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Q. A particle is projected with velocity $u$ inclined at an angle $\alpha$ with $x-axis$. Change in velocity of the particle on return to ground is

Motion in a Plane

Solution:

Initial velocity along y axis = u sin $\alpha$
Final velocity along y axis = - u sin $\alpha$
Change in velocity = u sin $\alpha$ - $(-u\,sin\,\alpha)$ = $2\,u\,sin\,\alpha$

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