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A student on a skateboard is moving at a speed of 1.40 m/s at the start...



A student on a skateboard is moving at a speed of 1.40 m/s at the start of a 2.45 m high and 12.4 m long incline. The total mass is 53.5 kg, air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, and the speed at the lower end of the incline is 6.60 m/s. Determine the work done (in J) by the student as the skateboard travels down the incline.

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Answer #1

Here,

for the work done is W

total work done = change in kinetinc energy

W + 53.5 * 9.8 * 2.45 - 41 * 12.4 = 0.50 * 53.5 * (6.6^2 - 1.4^2)

solving for W

W = 336.7 J

the work done by the student is 336.7 J

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