Question

Please help!!
An astronaut drops a rock into a crater on the moon. The distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t) = 0.8t^2. What is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

Answer 1

dt = 2(0.8)t = 1.6t = 1.6(10) - 1.6(5) = 8 m/s