Practice question

MCQ

Question

A 1kg stone in a vertical circle of radius 4m has a speed of 20m/s at the bottom. A tangential force of 4N acts downward from bottom to top. What is the tension at the top? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

90 N Correct 72 N 108 N 92 N

Explanation

At bottom: Tb−mg=mvb2/r⇒Tb−1×10=1×(20)2/4. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 90 N. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.

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