HELP fromtop of cliff, a person uses slingshot to fire a pebble downward--the negative direc. [read more down]

Question

from the top of cliff, a person uses slingshot to fire a pebble downward--the negative direc. the initial speed of the pebble is 9 m/s. a)what is the acceleration [magnitude+direction] of the pebble durng downward motion? is the pebble deacclerating? B) after .50 seconds, how far beneath the cliff top is the pebble?

Answer 1

a) acceleration = g = -9.81 m/s^2. The pebble is accelerating downward; its absolute speed is increasing.
b) s = v0t + at^2/2 = -5.726 m.