a box initially on the shelf at a height h is pushed out of the shelf and allowed to fall to the ground. But imagine that before pushing the box off, we have attached it to a spring anchored to the shelf that stretches vertically as the box fall. We observe that the vertical velocity of the box is zero just as it arrives at the floor. Taking our system to be box and the spring., when the box reaches the floor , the change in the sytem potential enerty (which is stored in spring) is equal to
a. zero
b. the negative of change in total energy of the system
c. the work done by gravity on the system
d. the maximum kinetic enerrgy of the box
e. the work done on spring by the box