I'm having trouble understanding this word problem.(adsbygoogle = window.adsbygoogle || []).push({});

A construction worker drops a bolt while woring on a high-rise building 320m above the ground. After t seconds, the bolt has fallen a distance of s metres, where

s(t) = 320-5t^2, o < t < 8

a. Find the average velocity during the first, third and eighth seconds.

I have to use f(x + h) - f(x)/h

I got 5(t +h)

The answer is 5m/s for the first one.

How do I get the rest of them (third and eighth second)?

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# Average Rate of Change (word problem)

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