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JAMB Physics 2017 Paper
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© africaexams.com
Question : 26
Total: 49
A string of length 5cm is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms
−
2
]
0.04m
0.12m
0.01m
0.08m
Validate
Solution:
From Hoke's Law, F = ke, K = Constant of Force
For he first case, Force = mg,
= 0.8 × 10 = 8N
∴ 8 = k × 0.04
k =
8
0.04
=
200
N
m
Since K is constant
For the second case, F = ke
F = 200 × e
∴ e =
F
200
=
16
200
= 0.08m
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