A body is projected up with an initial velocity u m/s. It goes up to a height h metres in t seconds time. Then it comes back at the point of projection. Considering negligible air resistance, which of the following statement is true? (a) the acceleration is zero (b) the displacement is zero (c) the average velocity is 2h/t (d) the final velocity is 2u when body reaches projection point.
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the final velocity is 2u when the body reaches projection point
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Answer:
Explanation:
Since initial position and final position of the body are same, displacement will be equal to zero.
Average velocity = Total displacement / Total time =0
Acceleration =−9.8 m/s
2
Final velocity on reaching the point of projection is −u.
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