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Question

Two stones are thrown vertically upwards simultaneously from the same point on the ground with initial speeds u1=30 m/sec and u2=50 m/sec. Which of the curves represents correct variation (for the time interval in which both reach the ground) of
(x2āˆ’x1)= the relative position of second stone with respect to first with time (t).
(v2āˆ’v1)= the relative velocity of second stone with respect to first with time (t).
Assume that stones do not rebound after hitting the ground

A
A
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B
B
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C
C
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D
D
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Solution

The correct option is D D
While both the stones are in flight, a1=g and a2=g
So arel=0Vrel= constant
xrel=(const)t
Curve of xrel vs t will be straight line till a stone hits the ground.
After the first particle drops on ground, the separation (xrel) will decrease parabolically (due to gravitational acceleration), and finally becomes zero.
and vrel= slope of xrel w.r.t. time.

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