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**Complex physics kinematics problems help!**

I'm having difficulty with these physics problems. I would really appreciate it if someone could help me.

## Homework Statement

1) Steven throws a rock off a cliff, giving it a velocity of 8.3 m/s [down). He heard the splash when the rock hit the river below, exactly 6.9s after he threw the rock. How high is the cliff above the river? Assume the speed of sound equals 330 m/s.

## Homework Equations

I've been given

v = d/t

a = (v2-v1)/t

d = ((v2 + v1)/2) t

d = (v1)t + 1/2a(t^2)

d = (v2)t - 1/2a(t^2)

d = (v2^2 - v1^2)/2a

## The Attempt at a Solution

I don't have the slightest clue how to begin solving this question. I don't know how the speed of sound ties into the solution

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