Question

PHYSICS QUESTION (Olympiad level) ​

Answer 1

For the upward motion of the block, we take into account all the forces acting on it: the force of gravity mg, the normal reaction N, and friction  and obtain the following equation: The corresponding equation for the downward motion is Let the distance traversed by the block in the upward and downward motion be s. Then the time of ascent t1 and descent t2 can be determined from the equations By hypothesis 2t1 = t2, where 4a2 = a1. Consequently, and finally Read more on Sarthaks.com - https://www.sarthaks.com/238843/block-pushed-upwards-along-the-roof-forming-angle-with-the-horizontal-the-time-the-ascent

Answer 2

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a block is pushed up what's along the rules forming an angle Alpha with the horizontal the time of the ascent of the block to the point was found to be half the time of its decent to the initial point

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different forces act on the block when it is prevented from falling or pushed up.

a block is pushed up what's along the rules forming an angle Alpha with the horizontal the time of the ascent of the block to the point was found to be half the time of its decent to the initial point when the applied force fh is meant preventing the block from falling. so friction force acts upward and is against the pulling force .

So , mg × Alpha .

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