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A particle is projected with a velocity of 20 m/s at an angle of `30^@` with a plane of inclination `30^@` with respect to the horizontal . The particle hits the inclined plane at an angle of `30^@` . Find the (a) time of impact, (b) the height of the point of impact from the horizontal plane passing through the point of projection.

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The correct Answer is:
1.76s; 15.3 m
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