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8 March, 09:51

what is haopening to the speed and acceleration as a car travels from rest to 72 km/hr in 4.0 seconds?

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  1. 8 March, 10:11
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    From the given information, we don't know. All we can tell is the net effect of all the changes during those 4 seconds ... the "averages".

    The average change in speed is an increase of 72 km/hr (20 m/s) during that time.

    The average acceleration is a constant 18 km/hr/sec (5 m/s^2) during the same time.

    But both the speed and the acceleration may have gone up or down many times during the 4 seconds.
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