A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground

Jamb 1978

A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground?

(Take g = 10m/s²)

A. 9s

B. 4.5s

C. 6s

D. 7.5s

E. 3s

ANSWER: Option E

EXPLANATION: using the equation of the motion S = ut + ½gt² and making time taken t the subject of the formula.

Where in this case:

S –> the height of the tree

u –> the initial velocity which in this case is zero

t –> time take to reach the ground

g –> acceleration due to gravity

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