Ablock of mass 3.7 kg, which has an initial velocity of 7.9 m/s at time t = 0, slides on a horizontal surface. calculate the work that must be done on the block to bring it to rest. answer in units of j.

115.46 J work must be done on the block to bring it to rest.

Explanation:

From law of conservation of energy, neglecting the friction, we know that:

Work done to stop the body = 1/2 mv²

Work done to stop the body = 1/2 (3.7 kg) (7.9 m/s)²

Work done to stop the body = 115.46 J

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