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Sagot :
The velocity of ball with respect to ground is 55km/h whereas with respect to car is 35km/h travelling opposite to its motion.
speed of ball relative to the truck = 15km/h
speed of truck relative to ground = 70km/h
(a) velocity of the ball relative to ground = speed of ball + speed of truck
Vb = (-15 )+75 [here - indicates that speed of ball is relative to the truck in the direction opposite its motion]
Vbg = 55km/h
(b) speed of car = 90km/h
velocity of the ball relative to car = 55 + (-90) as car is travelling opposite to ball.
Vbc = 35km/h
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?
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