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A ball has initial momentum +7.0 kg m/s. It collides with a wall and bounces straight back with no loss of kinetic energy. The ball's change in momentum is:
O a.-14 kg -m/s.
b. 14 kg m/s.
O.0.
d. 7.0 kg m's.
Oe-7.0 kg-m's.

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