# Question

A person riding in the back of a pickup truck traveling at 70 km/h on a straight, level road throws a ball with a speed of 15 km/h relative to the truck in the direction opposite to the truck’s motion. What is the velocity of the ball?

(a) Relative to a stationary observer by the side of the road, and

(b) Relative to the driver of a car moving in the same direction as the truck at a speed of 90 km/h?

(a) Relative to a stationary observer by the side of the road, and

(b) Relative to the driver of a car moving in the same direction as the truck at a speed of 90 km/h?

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