A pebble is dropped from a bridge, and the distance it falls is given by the equation d ( t ) = 15 t 2 d(t)=15t^2 , where d d is in meters and t t is in seconds. If the pebble takes 7 7 seconds to reach the water below, what is the height of the bridge? Also, calculate the pebble's speed upon hitting the water in kilometers per hour.

735 m , 756 k m / h 735\text{ }m,\text{ }756\text{ }km/h

735 m , 378 k m / h 735\text{ }m,\text{ }378\text{ }km/h

735 m , 189 k m / h 735\text{ }m,\text{ }189\text{ }km/h

235 m , 189 k m / h 235\text{ }m,\text{ }189\text{ }km/h

A pebble is dropped from a bridge, and the distanc...

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