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
Verified Correct Answer: A.
Physical Principles & Numerical Solution
u = 0, g = 10 \(ms^2\), v = 5 m/s, h = ?
From \(v^2 = u^2 + 2gh\)
⇒ \(5^2 = 0^2 + 2 \times 10 \times h\)
25 = 0 + 20h
25 = 20h
Therefore, h = \(\frac{25}{20}\) = 1.25m
Source: Myschool Past Questions Archive (Record #69378)