Velocity in calculus

Question

If a rock is thrown upward on the planet Mars with a velocity of 14 m/s, its height (in meters) after t seconds is given by H = 14t − 1

(c) When will the rock hit the surface? (Round your answer to one decimal place.)

(d) With what velocity will the rock hit the surface?

Answer 1

Catherine:

The rock hits the surface when H = 0; solve 14t-1 = 0

The velocity is simply dH/dt = 14 m/s