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Physics, 28.06.2021 19:40 hanz73

Alana is skateboarding at 19 km/h and throws a tennis ball at 11 km/h to her friend Oliver who is behind her leaning against a wall. What is the speed of the tennis ball if someone was watching the exchange on the sidewalk?

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Alana is skateboarding at 19 km/h and throws a tennis ball at 11 km/h to her friend Oliver who is be...
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