Which of the following curves represents the v–t graph of an object falling on a metallic surface and bouncing back?

JEE Main Physics question

Which of the following curves represents the – graph of an object falling on a metallic surface and bouncing back?

(A)A straight declining line only
(B)A "V"-shape (speed graph, smoothly crossing zero)
(C)A straight declining line to a trough, then a smooth rise (no discontinuity)
(D)A straight declining line to a trough, an instantaneous (dashed) vertical jump upward at the bounce, then declining againCorrect

Answer: (D)

As in Q183, the instantaneous collision must produce a sudden jump in at the bounce

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Question ID VK-152075