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  4. A particle has angular momentum equal to A. The angular momentum becomes 4A after 4 sec. Find the torque applied:

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Q. A particle has angular momentum equal to A. The angular momentum becomes 4A after 4 sec. Find the torque applied:

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Solution:

Using the formula for torque $ \tau =\frac{\text{difference in angular momentum}}{\text{time}} $ $ \tau =\frac{4A-A}{4}=\frac{3A}{4} $