(Ignore air resistance for this problem.) Two identical balls are thrown simultaneously from the top of a very tall cliff. Ball A is thrown downward with an initial velocity of 6 m/s, while ball B is thrown straight upward with an initial velocity of 9.8 m/s. After one second has elapsed, the
A. acceleration of ball A is upward.
B. velocity of ball A is 9.8 m/sec2.
C. velocity of ball B is zero.
D. acceleration of ball A is greater than that of ball B.
E. acceleration of both balls is zero.
Answer: C
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