A ball of mass 0.8 kg is dropped from a height, H. Just before hitting
PHYSICS
WAEC 2023
A ball of mass 0.8 kg is dropped from a height, H. Just before hitting the ground, its velocity is 5.0 m/s. Determine H. [g = 10 ms-2]
- A. 1.25m
- B. 4.00m
- C. 6.25m
- D. 1.60m
Correct Answer: A. 1.25m
Explanation
u = 0, g = 10 \(ms^2\), v = 5 m/s, h = ?
From \(v^2 = u^2 + 2gh\)
⇒ \(5^2 = 0^2 + 2 × 10 × h\)
25 = 0 + 20h
25 = 20h
Therefore, h = \(\frac{25}{20}\) = 1.25m
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