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Question

Two particles at t=0 are thrown horizontally in opposite directions from the same point from a height h with velocities 4 ms1 and 3 ms1. Find the time when their velocities are perpendicular.

A
0.15s
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B
0.25s
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C
0.35s
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D
none of these
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Solution

The correct option is D 0.35s
V1=4^igt^j and V2=3^igt^j are the velocities at any instant.
For velocities to be perpendicular V1.V2=0
V1.V2=0 t=12g2=0.35s

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