Instant velocity help? Can someone check my work for this problem? I have the average rate of ascent as 1666m/ hr, and the instant velocity im somewhat lost on. Here's the description: A prototype plane is testing its ability to climb in altitude. After 1 hr the plane is 1000m up from the ground, after 4 hr the plane is 6000m up. What is the average rate of ascent from point A to point B(6000), and whats the instant. velocity when reaching point B?

Question