Posted by **Melissa** on Wednesday, April 25, 2012 at 3:00pm.

A 60 kg student does 60 push ups in 40s . With each push up , the student must lift 70% of the body mass a height of 40cm off the floor. Assuming two significant digits, calculate the following

The work the student does against a force of gravity for each push up , assuming work is done only when the student pushes up

The total work done against the force of gravity in 40s

The power achieved for this period

- physics -
**Dev**, Wednesday, April 25, 2012 at 3:12pm
(60 kg)(9.8 m/S^2) = Force in Newton

- physics -
**Damon**, Wednesday, April 25, 2012 at 3:55pm
m g * .40 = 60 * 9.8 * .7 = 412 Newtons force

distance up = .40 meters

work per push up = .40*412 = 165 Joules per push up

total work = 165 * 60 = 9878 Joules

power = work/time = 9878/40 = 247 watts

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