# Physics

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. A rock thrown horizontally at a large bell 57.0 m away is heard to hit the bell 4.10 s later. If the speed of sound is 330 m/s, what was the speed (in meters/second) of the rock? (Disregard gravity.)

• Physics -

V*t = 57 m.
330 * t = 57,
t = 57/330 = 0.173 s. = Time for sound
to travel 57 m.

T = 4.10 - 0.173 = 3.927 s. = Time for rock to travel 57 m.

V*T = 57 m.
V = 57 / T = 57 / 3.927 = 14.5 m/s. =
Speed of rock.

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