Posted by tcp on Wednesday, May 16, 2012 at 7:02pm.
the janitor exerted 80 newtons of forse to push the meterlong hall against the forse of friction. then he lifted the box weighing 220 newtons onto the second shelf, which was 1 meter off the floor. How much work did the janitor do?

science  johnny, Tuesday, May 22, 2012 at 5:06am
work = force x distance
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