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Question

On an inclined plane of inclination 30, a ball is thrown at an angle of 60 with the horizontal, from the foot of the incline, with a velocity of 103 ms1. Then, the ball will hit the inclined plane in time: (take g=10 ms2)

A
1 s
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B
2 s
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C
23 s
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D
43 s
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Solution

The correct option is B 2 s

The time of flight on an inclined plane is
T=2v sin θg cos α
T=2×103×sin(6030)g cos 30
=2 s

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