Calculus help please?

Question

at t seconds after lift off a rocket is at a height of 3t^2 ft. How fast is the rocket traveling after 10 seconds

Answer 1

The derivative of a position function will always give the instantaneous velocity at any time. Here the derivative is 6t. So at 10 seconds, the speed would be 60. It's unclear what the label would be, but it's likely either ft/sec or m/sec.

Answer 2

I think dmb is correct. It is 60.