A block of mass m100 kg is moving down an incline that, Ask an Expert

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A block of mass M=100 kg is moving down an incline that makes an angle of 30 degrees relative to the horizontal. The block is initially moving at a speed of 15 m/s. The block moves a distance x=20 m down along the incline before it is brought to rest by friction. How much work is done by friction during this process?

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