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Question

A stone is projected from level ground such that its horizontal and vertical components of initial velocity are ux=10 m/s and uy=20 m/s respectively.
Then the angle between velocity vector of stone one second before and one second after it attains maximum height is:

A
45
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B
90
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C
30
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D
60
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Solution

The correct option is B 90
Diagram

It can be seen from the figure that the angle between the velocity vectors 1 sec before and 1 sec after it attains maximum height is 90

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