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worty [1.4K]
4 years ago
15

A friend is riding on the back of a truck that is going away from you at 20 km/h. As the truck passes, your friend throws a ball

toward you at 60 km/h relative to her. How fast is the ball going relative to you?

Physics
1 answer:
Pepsi [2]4 years ago
4 0

Since the ball moves in the relative direction opposite to the displacement of the car, the speeds must be subtracted, so

v= 60-20

v = 40km/s

Both move opposite directions. The attached graphic helps to better appreciate the problem in question, which concludes that the relative speed is 40km / s

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