Trevor is pulling his younger brother in a wagon. he pulls
the wagon 50 m to the corner with a force that is parallel
with the ground. he then turns the wagon around and pulls
it 50 m back to the starting point with the same force at an
angle of 30° with respect to the ground.
how does the amount of work trevor performs going to the
corner compare with the amount of work he performs
coming back?
they are the same because he uses the same amount
of force
they are the same because he travels the same
distance.
he does less work coming back because the force
moving the wagon is only 50cos 30°
he does more work coming back because the force
moving the wagon is only 50cos60°