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3 September, 11:40

You started to run at 10 km/h when you left your house and you arrived at school 30 minutes later. Assuming that your average acceleration was 30 km/h/h, how fast were you running when you arrived? a) 15 km/hb) 20 km/hc) 25 km/hd) 30 km/h

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  1. 3 September, 11:52
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    correct option is C i. e. 25 km/hr

    Explanation:

    given dа ta:

    Initial velocity u = 10 km / h

    acceleration a = 30 km/h^2

    time = 30 min = 1/2 hr

    we know from equation of motion, final velcoity is given as

    final velocity = initial velocity + at

    v = u + at

    putting all value from above to get the final velocity value

    v = 10 + 30 * (1/2)

    v = 25 km/hr

    so correct option is C i. e. 25 km/hr
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