A body of mass 20g projected vertically upwards in vacuum returns to the point of...

WAEC 2013

A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms\(^{-2}\)]. Calculate the speed of projection

A. 1.2ms^-1
B. 6.0ms^-1
C. 12.0ms^-1
D. 0.6ms^-1

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Correct Answer: Option C

Explanation

V = u - gt

u = v + gt

= 0 + 10 x 1.2

= 12ms\(^{-1}\)

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A body of mass 20g projected vertically upwards in vacuum returns to the point of...

Correct Answer: Option C

Explanation

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