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JAMB Physics 2017 Paper

Question : 43

Total: 49

Solution:

Concept:

A freely falling object starts from rest and accelerates uniformly under gravity.

Explanation:

Initial velocity,

u = 0 \, \text{m/s}

Height,

H = 20 \, \text{m}

Acceleration due to gravity,

g = 10 \, \text{m/s}^2

Use the equation of motion:

H = ut + \frac{1}{2}gt^2

Since the fruit falls from rest,

u = 0

, so

H = \frac{1}{2}gt^2

Substitute the values:

20 = \frac{1}{2} \times 10 \times t^2

This gives

20 = 5t^2

, so

t^2 = 4

Therefore,

t = \sqrt{4} = 2 \, \text{s}

Answer:

The time taken is

2 \, \text{s}

, which is option D.

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