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22 September, 23:18

A car accelerates from 30 km/hr to 65 km/hr in 30 seconds. What is it's acceleration?

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  1. 22 September, 23:30
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    Acceleration = (change in speed) / (time for the change).

    = (35 km/hr) / (30 sec)

    = 7/6 km/hr-sec.

    To get rid of that ugly unit, and change the solution to a

    more familiar unit of acceleration, we need to convert it

    to the usual ' m/s² '. This is not a major operation.

    (7/6 km/hr-sec) x (1000 m/km) x (1 hr/3600 sec)

    = (7/6 x 1,000 : 3600) km-m-hr / km-hr-sec-sec

    = 0.324 m/s² (rounded)

    (This a rather gentle acceleration ... about 0.03 of a 'G' ...

    so it would not mash you back into your seat in the car.)
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