If a rock is thrown upward on the planet Mars with a velocity of 10 m / s, its height in meters t seconds l...

If a rock is thrown upward on the planet Mars with a velocity of 10 m / s, its height in meters t seconds later is given by y = 10t - 1.86t^2. Find the average velocity over the interval [1, 2].

v = 4.42 m / s correct?

y(2) - y(1) = 12.56 - [8.14] = 4.42 m
v = 4.42 m/s
Yes you are correct.