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

Question

Physics

Marisa Hoover

11 September, 22:33

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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Answers (1)

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Elise Turner · Answer 1

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.