A person riding in the back of a pickup truck traveling at 70 km/h on a straight

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 10 km/h relative to the truck in the direction of the truck's motion. What is the velocity of the ball relative to a stationary observer by the side of the road? Express your answer as a whole number. v_b0 = km/h What is the velocity of the ball relative to the driver of a car moving in the same direction as the truck at a speed of 90 km/h ? Express your answer as a whole number. v_bt = km/h

Explanation / Answer

a) Velocity of ball relative to stationary observer

v = 70 + 10

vbo= 80 km/h

b) Velocity of ball relative to the driver

vbt = 90 - 80

vbt = 10 km/h

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