A block is released from rest and slides down an incline. The coefficient of sliding friction is

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A block is released from rest and slides down an incline. The coefficient of sliding friction is 0.38, and the angle of inclination is 60.0°. 

(a) Use energy considerations to find how fast the block is sliding after it has traveled a distance of 30.0 cm along the incline. 

(b) Solve the same problem using Newton’s second law instead of energy. Which method iseasier?

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