A stone is tossed in the air from ground level with an initial velocity of15m/s. Its height at timetish(t) = 15t - 4.9t^2m.

Compute the stone's average velocity over the time interval[1, 3.5].Average velocity https://webwork.math.lsu.edu/webwork...bf9402a711.png ?

I tried to solve it, but when time is '3.5' v became minus...