JEE Main Physics question

Physics Motion in a Straight Line JEE Main

A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored [AIIMS 2003]

(A)A symmetric "V", both arms straight and of equal duration
(B)A "V" with the left (descending-speed) arm concave and longer
(C)A "V" with both arms curved outward equally
(D)An asymmetric "V": the ascent (speed falling to zero) is shorter/straighter, the descent (speed rising) is longer and concave, approaching an asymptoteCorrect

Answer: (D)

Solution

Air drag adds to gravity during ascent (faster deceleration, shorter rise time) and opposes gravity during descent

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Question ID VK-152454