A. 15N
B. 20N
C. 30N
D. 60N
Correct Answer:
Option B – 20N
Explanation
Since the lever is a uniform one, its center of gravity will be acting half way (i.e 45cm)
∴from the principle of moments,
F x 45 = 30 x 30
∴ F = (30 x 30) / 45 = 20N
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