physics

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 9.0 m/s.
(a) What is the acceleration (magnitude and direction) of the pebble during the downward motion?

*Is the pebble decelerating?
* After 0.46 s, how far beneath the cliff top is the pebble?

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