15.
A particle is projected perpendicularly to an inclined plane as shown in the figure
given. If the initial velocity of the particle is u, calculate how far from the point of
projection does it hit the plane again if the distance is measured along the plane?
(A) 2u_lg
(B) zero
(C) (2u²/g) sin e
(D) (2u²/g) tan 0 sec o
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Answer:(D)
Explanation:for the ease of solving this question a new coordinate axis has to be taken such that the +ve y- axis is now in the direction of initial velocity.
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