CBSE Class 12-science Answered
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Asked by jain.pradeep | 27 Apr, 2019, 10:51: AM
Expert Answer
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, 16:58: PM
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