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Starting from rest, a body slides down a 45° inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is:

1. 0.80
2. 0.75
3. 0.25
4. 0.33

Correct answer: 0.25

Solution

The time taken with friction is twice the time taken without friction. Using the equation of motion and considering the forces acting on the inclined plane, the coefficient of friction is calculated as μ = 0.25.

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