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Ostrovityanka [42]
2 years ago
5

kristine speeds past a parked police car at 32 m/s. The police car starts from rest with a uniform acceleration of 2.5 m/s^2. Ho

w much time passes before the police car overtakes Kristine's car?. How far does she travel before the police car overtakes her car?​
Physics
1 answer:
Digiron [165]2 years ago
7 0

32 = 0 \times t +  \frac{1}{2} \times 2.5 \times t^{2}     \\  32 = 0 + 1.25 \times t {}^{2}  \\ 32 = 1.25t {}^{2}   \\   \frac{32}{1.25}  =  \frac{1.25t {}^{2} }{1.25}  \\ t {}^{2}  = 25.6 \\  \sqrt{t {}^{2} }  =  \sqrt{25.6}  \\ t = 5.1seconds \\

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Explanation:

The free body diagram of this question is shown on the first uploaded image

From the question we are told that

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The mass center of the cyclist and the bicycle is m_h = 40 \ in above the ground

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=>             a = \frac{26}{40} g

Here  g = 32.2 ft/s^2

     So     a =  \frac{26}{40} (32.2)

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Apply the equation of motion to this motion we have

       v^2 = u^2 + 2as

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             and v = 0 since the bicycle is coming to a stop

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