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4 August, 12:37

A car starts with a speed of 20km / hr and accelerates at a rate of 3.4 m/s for 20 seconds. What is the final speed of the car in km/hr?

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  1. 4 August, 12:47
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    The relevant formula that we can use in this situation is:

    v = v0 + at

    where v is the final velocity, v0 is the initial velocity = 20 km/hr, a is acceleration at 3.4 m/s^2 and t is time at 20 seconds

    First convert v0 to m/s, v0 = 5.56 m/s

    v = 5.56 m/s + 3.4 m/s^2 * 20 s

    v = 73.56 m/s

    Then convert back to km/hr:

    v = 264.82 km/hr
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