Suppose that you toss a rock upward so that it rises and then falls back to the earth. If the acceleration due to gravity is 9.8 m/sec2,
what is the rock's acceleration at the instant that it reaches the top of its trajectory (where its velocity is momentarily zero) ?
Assume that air resistance is negligible.
A) The acceleration of the rock is zero.
B) The rock has an upward acceleration of 19.6 m/s2.
C) The rock has a downward acceleration of 19.6 m/s2.
D) The rock has a downward acceleration of 9.8 m/s2.
E) The rock has an upward acceleration of 9.8 m/s2.
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