Please please please help A 10g copper sphere was moving 40 m/s when it hit another object. This caused all of the KE to be converted into thermal energy for the copper sphere. How much energy was converted into thermal energy (heat)?

A. 0.0 J
B. 40 J
C. 200 J
D. 8.0 E3J

Ithink the answer would be a

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j