math

A stone is tossed vertically into the air from ground level with an initial velocity of 15 m/s. Its height at time t is h(t)=15t-4.9t^2.

Compute the stone's average velocity over the time interval [0.5, 2.5].

It says the answer is .3, but I keep getting something not close to that...

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  1. avg velocity = (h(2.5) - h(.5) )/(2.5 - .5)

    I get exactly .3

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