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Hailstones falling vertically with speed...

Hailstones falling vertically with speed of 10 m/s hit with respect to himself the windscreen of a moving car and rebound elastically. Find the velocity of the car if the driver find the haolstones rebound vertically after striking. Windscreen makes an angle `30^(@)` with the horizontal.

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The correct Answer is:
`10 sqrt(3) m//s`
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