JEE Main Physics question

Physics Motion in a Straight Line JEE Main

Which of the following – graphs represents the motion of a ball falling freely from rest under gravity and rebounding from a metallic surface?

(A)A straight declining line only, with no jump
(B)A "V"-shape (speed graph), continuously crossing through zero
(C)A straight line declining to a trough, with an instantaneous jump upward at the moment of impact, then declining againCorrect
(D)A straight rising line only

Answer: (C)

Solution

During the fall, decreases linearly (constant ) to its most negative value at the instant of impact. The bounce reverses the velocity's sign **instantaneously** (collision duration negligible), after which again declines linearly

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Question ID VK-152070