JEE Main Physics question

Physics Motion in a Straight Line JEE Main

A mass throws a stone, vertically up with a speed of 20 ms from top of a high rise building. Two seconds later, an identical stone is thrown vertically downward with the same speed 20 ms. Then (use g = 10 ms)

(A)The relative acceleration between the two is equal to zeroCorrect
(B)The time interval between their hitting the ground is 2 sCorrect
(C)Both will have the same KE, when they hit the groundCorrect
(D)The relative velocity between the two stones remains constant till one hits the groundCorrect

Answer: (A),(B),(C),(D)

Solution

Both stones are in free fall (acceleration each) once released, so their relative acceleration is always zero — (A) true. Taking up positive from the top, stone 1: ; stone 2 (released at ): . Velocities: , ; ms,

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Question ID VK-152153