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A 4 kg mass on a rope is held aside by a 30 N horizontal pull (g = 10 m/s²). Upper rope tension?
A70 N
B40 N
C50 N
D10 N
Answer & Solution
Correct answer: C. 50 N
At the pulled point the upper tension balances the 40 N weight and the 30 N pull, so it equals the square root of 1600 + 900, which is 50 N.
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