Question

A particle is projected vertically upwards with a velocity u from a point O. When it returns to the point of projection:

A
Its average velocity is zero
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B
Its displacement is zero
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C
Its average speed is u2
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D
Its average speed is u.
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Solution

The correct options are A Its average velocity is zero B Its displacement is zero C Its average speed is u2When it returns to the same point, its net displacement is zero. Time of flight T=2ug, Maximum height reached is u22g and total distance travelled is u2g Average velocity =displacementtime=0 Average speed =distancetime=u2g2ug=u2

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