Hey everyone. I'm new to this site and was wondering if u can help me with a work and power problem.(adsbygoogle = window.adsbygoogle || []).push({});

Question:

A 60kg student runs at a constant velocity up the incline described in the diagram in 4.5s. Calculate the power output of the student.

The diagram was a picture of a right-angled triangle with hypotenuse length 4 meters. The hypotenuse is the ramp, and the ramp is raised to a height of 2.5m (also the length of the vertical leg). The student is running up the ramp.

My Work:

Since he is running at constant velocity, acceleration = 0m/s/s.

F=ma, so F = 0 N.

W=Fd, so W = 0 J.

P=W/t, so P = 0 W.

The answer from the back of the book was P = 326.67 W.

I know the student is doing work in terms of his muscles having a tensional force, but I don't think that is the way to go with this problem at all.

Anyways, any help will be appreciated thanks.

BTW, there was no information regarding friction.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Work and Power

**Physics Forums | Science Articles, Homework Help, Discussion**