A rock thrown horizontally at a large bell 54.0 m away is heard to hit the bell 4.80 s later. If the speed of sound is 330 m/s, what was the speed (in meters/second) of the rock? (Disregard gravity.)

Answer 1

Let V be the rock horizontal velocity.

(Rock travel time) + (sound travel time) = total time delay = 4.80 s

54/V + 54/330 = 4.80

54/V = 4.636 seconds

Solve for V, in m/s