# Chapter 4 - Problems - Page 149: 33

Glenda will hear a splash $~~1.22~s~~$ after she releases the coin.

#### Work Step by Step

We can find the time it takes for the coin to fall 7.00 meters: $\Delta y = \frac{1}{2}a_yt^2$ $t = \sqrt{\frac{2\Delta y}{a_y}}$ $t = \sqrt{\frac{(2)(7.00~m)}{9.80~m/s^2}}$ $t = 1.195~s$ We can find the time it takes for the sound to travel 7.00 meters: $t = \frac{d}{v} = \frac{7.00~m}{343~m/s} = 0.0204~s$ The total time is $1.195~s+0.0204~s = 1.22~s$ Glenda will hear a splash $~~1.22~s~~$ after she releases the coin.

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