Question

A tennis ball is thrown vertically upward in an evacuated chamber with an initial Velocity of 20.0m/s at time of 0s. Approximately what is the initial speed of the ball relative to an observer in a car that moves horizontally pass the evacuated chamber with a constant speed of 30.0m/s

Answer 1

√(30^2 + 20^2) = √1300 m/s