Problem: A brass ball is shot vertically upward from the surface of an atmosphere-free planet with an initial speed of 20.0 m/s. One second later, the ball has an instantaneous velocity in the upward direction of 15.0 m/s.
Part A: How high does the ball rise?
Please provide all steps to determine how high the ball rise and don't assume that the acceleration is -9.8 m/s2.