We affixed stones on the end of a 7,5meter long rope and 3m from its end. We soon released the rope and we dropped the stones from a bridge into a river. We measured 0,15 s time between the stones' splashing. How high is the bridge over the water?

As the rope is 7.5 meters long, the bridge has to be at least that high.

Now the in 0.15 seconds a stone travel s = 1/2 gt^2 = 1/2 x 9.8 x 0.15 x 0.15 = 0.11 m

Therefore the total height of the bridge is 7.5 + 0.11 = 7.61 meters

Answer : 7.61 meters

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