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Suppose you read about a new car that can go from 0 to $100 \mathrm{km} / \mathrm{h}$ in only 2.0 seconds. What is this car's acceleration?a. about $50 \mathrm{km} / \mathrm{h}$b. about $14 \mathrm{m} / \mathrm{s}^{2}$c. about $50 \mathrm{km} / \mathrm{s}^{2}$d. about $200 \mathrm{km}$e. about $0.056 \mathrm{km} / \mathrm{h}^{2}$

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acceleration is a change in speed over a change in time. So if the car goes from 0 to 100 kilometers per hour, that means the change in speed is 100 kilometers per hour and the change in time is two seconds. Um, well, first of all, I do need to convict convert units. And so, um, I see that it says per hour and there are 3600 seconds in an hour. So through 3600 seconds in one hour, the our unit will cancel out. And so I'm also going to convert kilometers, um, kilometers air in the numerator. So there's 1000 meters in one kilometer. Now the kilometers will cancel out. So using a calculator 1000 times, 100 divided by two, divided by 3600 gives me about 14 meters per second squared. And that is be

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