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Question

A particle is projected down on inclined plane with a velocity of 21m/s at an angle of 60o with the horizontal. Its range on the inclined plane, inclined at an angle of 30o with the horizontal is

A
21dm
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B
2.1dm
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C
30dm
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D
6dm
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Solution

The correct option is D 6dm
Range down the plane =2u2cosαsin(α+β)gcos2β
=2×21×21cos60osin90o10×cos230o
=2×441×1210×34=58.8cm
=5.88dm6dm.

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