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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?

Respuesta :

cjmejiab

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

[tex]v= 60-20[/tex]

[tex]v = 40km/s[/tex]

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

Ver imagen cjmejiab