4. (§5.2, 5pts each) Each function below represents the velocity (in ft/s) of an object which is thrown straight up at some initial height. Use each function to determine: • What

is the object's initial velocity? When does the object land on the ground? How long does it take for the object to return to its initial height? What is the maximum height of the object? Remember to include the proper units for your final answers. Round any answers to two decimal places if needed. a. v(t) = -32t+42 with initial height 10 ft b. v(t) = -32t +78 with initial height 70 ft