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Two stones are thrown up simultaneously from the edge of a cliff 240 m high with initial speed of 10 m/s and 40 m/s respectively. Which of the following graph best represents the time variation of relative position of the second stone with respect to the first ? (Assume stones do not rebound after hitting the ground and neglect air resistance, take g = 10 m/s 2 ) ( The figures are schematic and not drawn to scale )

1. (y 2 – y 1 ) m t → 8 12 t(s) 240
2. 240 (y 2 – y 1 ) m 12 t(s)
3. (y 2 – y 1 ) m 8 12 t(s) 240
4. (y 2 – y 1 ) m 8 12 t(s) 240

Correct answer: (y 2 – y 1 ) m 8 12 t(s) 240

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