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31-01-2017
Physics

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While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the speed of the tennis ball is km/h.

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31-01-2017

8 km/h I think good luck if it's wrong

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alanisjuvera10188 alanisjuvera10188

04-03-2019

the answer is 11 km/h ... i just took the test

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