A body of mass 20g projected vertically upwards in vacuum returns to the point of...
PHYSICS
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
Correct Answer: C. 12.0ms-1
Explanation
V = u - gt
u = v + gt
= 0 + 10 x 1.2
= 12ms\(^{-1}\)
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