537N thermal energy is created by friction during his descent.
The friction-related work is converted into thermal energy.
If Justin is initially at rest, MGH is his potential energy.
Thus, we have 30* 9.8*8 = 2352N.
Where,
Mass = m
Gravitational acceleration = g
Height = h
His potential energy is changed into usable kinetic energy when he reaches the bottom of the slide, leaving us with 1/2 mv^2.
Finally, we arrive to 1/2 * 30 * (11)^2 = 1815N
He had 2352N at the outset, and 1815N at the conclusion.
The thermal energy is therefore 2352 - 1815 = 537N.
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