(1 point) If a rock is thrown upward on the planet Mars with a velocity of 7 m/s, its height (in meters) after t seconds is given by H : 7t 7 1.86752. Find the velocity of the rock after one second. Velocity is ::: m/s Find the velocity of the rock when t : a. Velocity is 555 m/s When will the rock hit the surface? The rock will hit the surface after 555 With what velocity will the rock hit the surface? mfs Velocity will be (1 point) A train moves along a straight line. Its location at time t is given by 110 . . . . 3(t) : for 1 g t g 4, where t Is measured In hours and 3(t) IS measures In t kilometers. Find the average velocity of the train between t : 1 and t : 4. Average velocity is kilometers per hour. Find the instantaneous velocity of the train at t : 3. Instantaneous velocity is ::: kilometers per hour. Find the speed of the train at t : 3. Speed is .55 kilometers per hour