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15 August, 15:22

At what speed does a 1400 compact car have the same kinetic energy as a 20000 truck going 25?

Express your answer using two significant figures.

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  1. 15 August, 15:47
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    K=1400*V^2/2

    K=20000*25^2/2. = > 1400*V^2/2=20000*25^2/2 1400*V^2=20000*25^2

    14*V^2=200*225

    v^2=100*225/7

    v=250/7^ (1/2)

    Answer: 250*7^ (1/2) / 7
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