From the top of a cliff, a person uses a...

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

zero `m//s^(2)`

`9.8 m//s^(2)` downward

`9.8 m//s^(2)` , upward

`1.1 m//s^(2)`, upward

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