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24 September, 13:25

8. A car travels at a constant velocity of 70 mph for one hour. By the end of the second hour, the car's velocity was 60 mph. At the end of the third hour, the car's velocity was 80 mph. During which hour was their acceleration positive? During which hour was their acceleration negative?

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  1. 24 September, 13:47
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    Positive acceleration is in third hour and negative acceleration is in second hour.

    Explanation:

    Velocity of car in first hour = 70 mph

    Velocity of car in second hour = 60 mph

    Velocity of car in third hour = 80 mph

    Acceleration = Change in velocity / Time

    Acceleration in second hour = (60 - 70) / 1 = - 10 mph²

    Acceleration in third hour = (80 - 60) / 1 = 20 mph²

    So positive acceleration is in third hour and negative acceleration is in second hour.
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