If a rock is thrown upward on the planet Mars with a velocity of 14 m/s, its height in meters t seconds later is given by y = 14t − 1.86t^2.

Question

Estimate the instantaneous velocity when t = 1.

Answer 1

dy/dt = velocity up = 14 - 3.72 t
when t = 1
dy/dt = 14 - 3.72 = 10.28

Answer 2

10.28