Homework Help: physics

Posted by moon on Sunday, February 19, 2012 at 11:59am.

A car accelerates at a constant rate from zero to 20.5 m/s in 10 seconds and then slows to 15.9 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s2 during the 15 seconds?

physics - drwls, Sunday, February 19, 2012 at 12:08pm
The average acceleration during a period of time is the start-to-finish velocity change, divided by the length of time.

In this case, that would be
(15.9 m/s)/15 s = 1.06 m/s^2

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