If a rock is thrown upward on the planet Mars with a velocity of 10m/s, its height (in meters) after t seconds is given by H=10t-1.86t^2.

Find the velocity of the rock after one second.

If a rock is thrown upward on the planet Mars with a velocity of 10m/s, its height (in meters) after t seconds is given by H=10t-1.86t^2.

Find the velocity of the rock after one second.