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In preparation for this problem, review Conceptual Example 7. From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 9.09 m/s.

(a) What is the acceleration (magnitude and direction) of the pebble during the downward motion?

(b) After 0.640 s, how far beneath the cliff top is the pebble?

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