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Q. 9

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 227

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Short Answer

You throw a g coin straight down at m/s from a -m-high bridge.

a. How much work does gravity do as the coin falls to the water below? b. What is the speed of the coin just as it hits the water?

a). J work does gravity do as the coin falls to the water below

b). The speed of the coin is m/s

See the step by step solution

Step by Step Solution

Step 1. Given Information

Mass od the coin

Speed of the coin m/s

Height of the bridge m

Step 2. Part a). The work done by the gravity force

As the coin fall downward it accelerates with as a result its velocity changes,

Hence by calculating a change in its kinetic energy in the duration till it hits the water surface,

Step 3. Part b). Find its velocity before hitting water

Now,

For the equation of the motion:

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