JEE Main Physics question

Physics Motion in a Plane JEE Main

A child travelling in a train throws a ball outside with a speed (relative to the train), without specifying the direction of the throw. According to a child standing on the ground, the speed of the ball is

(A)Same as
(B)Greater than
(C)Less than
(D)May be greater than, less than, or equal to , depending on the direction of the throw relative to the train's motionCorrect

Answer: (D)

Solution

By relative velocity addition, . If the ball is thrown in the direction of the train's motion, ; if thrown opposite to it, , which can be less than, equal to, or greater than

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Question ID VK-158271