Choose the best answer to the following.
A shiny sports car at the top of a vertical cliff has a potential energy of 100 MJ relative to the ground below. Unfortunately, a mishap occurs and it falls over the edge. When it is halfway to the ground, its kinetic energy is
(a) the same as its potential energy at that point.
(b) negligible.
(c) about 60 MJ.
(d) more than 60 MJ.
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