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Two stones are thrown vertically upwards...

Two stones are thrown vertically upwards simultaneously from the same point on the ground with initial speed `u_(1) = 30 m//sec` and `u_(2) = 50 m//sec`. Which of the curve represent correct variation (for the time interval in which both reach the ground) of
`(x_(2) - x_(1))` = the relative position of second stone with respect to first with time (t)
`(v_(2) - v_(1))` = the relative velocity of second stone with respect to first with time (t).
Assuming that stones do not rebound after hitting.

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