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qn.18 :-  net force = mass × acceleration.  but acceleration ( g sinθ ) along the direction  is constant throughout the motion.
Hence graph-E  represents the net force.

qn.19 :-  speed of the block  = u - gsinθ t  , which is linearly decreasing during upward motion and linearly increasing during downward motion
Hence graph-A represents the speed of block

qn. 20 :-  potential energy is proportional to vertical distance h. Vertical distance h is given by,  h = u sinθ t - (1/2) g sinθ t2
Hence potential energy is a quadratic function and initially increasing while going up then decreasing while coming down.
Graph-D represents the potential energy.

qn. 21 :- since total mechanical energy is constant throughout the motion, graph-E represents the total mechanical energy
Answered by Thiyagarajan K | 27 Apr, 2019, 04:58: PM

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