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Starting from rest, a kid named Billy goes down a slide, which is a height of...

Starting from rest, a kid named Billy goes down a slide, which is a height of 2.5 m above the ground. Billy’s mass is 35 kg. There is friction acting on Billy, so that when he reaches the bottom of the slide (at ground level), his speed is only 3.5 m/s. Consider the total mechanical energy of the Earth + Billy system, which consists of kinetic and potential energy. How much mechanical energy was lost due to friction? Give your answer in Joules and round to the nearest decimal place.

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