Jill can throw a ball at a speed of 80 mph, consistently, on the ground. She gets into the back of a truck, which drives down the road in the
direction at 30 mph. Jill faces the back of the truck and throws a ball. According to Galilean relativity, what is the component of the velocity of the ball relative to the ground?
Master Special Vs. Galilean Relativity with a bite sized video explanation from Patrick Ford