A ball is projected horizontally from the top of a hill with a velocity of...

WAEC 1991

A ball is projected horizontally from the top of a hill with a velocity of 20m^-1. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10ms^-2)

A. 20m
B. 40m
C. 80m
D. 160m
E. 200m

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Correct Answer: Option C

Explanation

Initial horizontal velocity = 20ms^-1

Initial vertical velocity = 0

s = ut + \(\frac{1}{2}gt^2\) = 0 x 5 x 4²

= 80m

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A ball is projected horizontally from the top of a hill with a velocity of...

Correct Answer: Option C

Explanation

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