Batman, whose mass is 122 kg, is holding on to the free end of a 15.9 m rope, the other
end of which is fixed to a tree limb above.
He is able to get the rope in motion as only
Batman knows how, eventually getting it to
swing enough that he can reach a ledge when
the rope makes a 50.4
◦
angle with the vertical.
The acceleration of gravity is 9.8 m/s
2
.
How much work was done against the force
of gravity in this maneuver?
Answer in units of J.