- #1

WPCareyDevil

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**[SOLVED] (101)Acceleration due to gravity**

Ok, this should be really strait forward. Its only problem C that I am not getting correct.

## Homework Statement

An object is observed to fall from a bridge, striking the water below 3.36 s later.

(a) With what speed did it strike the water?

(b) What was the average speed during the fall?

(c) How high is the bridge?

## Homework Equations

a) 9.8*3.36 = 32.928 m/s - correct

b) Vi+Vf/2 = 16.464 m/s - correct

c) ?

## The Attempt at a Solution

Ok, acc due to gravity = 9.80m/s^2

So, in the first second, the object fell 9.8m. In the second second, it fell 19.6m. t=3 it fell 29.4m. t=3.36 it fell 32.928m.

Adding all of these would give me the total distance fallen (height of the bridge). The answer 91.728m is incorrect.

Am I attacking this the wrong way?

Thank you!