A soccer player kicks a rock horizontally off a 40.0m high cliff into a pool of water. If the player hears the sound of the splash 3.00s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343m/s© BrainMass Inc. brainmass.com April 3, 2020, 1:41 pm ad1c9bdddf
See attached file for sketch
We take the origin to be the top of the cliff.
y increases as we move down the cliff
The rock is hit with a velocity V in the horizontal direction
This velocity has no component in the y direction
x = V *t (since there is no acceleration in the x direction)
y=ut+1/2 a t ...
The solution calculates initial speed for projectile motion.