sorry i gave a bad answer
Take [down] as the positive direction.
<span>h = vt + 1/2 g t^2 </span>
<span>v is initial vertical speed </span>
<span>g is acceleration due to gravity </span>
<span>h = 15.0 m/s (2.00 s) + 1/2 (9.80 m/s^2 )(4 s^2) </span>
<span>h = 30.0 m + 19.6 m </span>
<span>h = 49.6 m </span>
<span>The bridge is 49.6 m above the water.
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the square root of 53 is the answer
