Physics, 10.09.2019 06:20 fitzghost

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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While skateboarding at 19 km/h, alana throws a tennis ball at 11 km/h to her friend oliver. if alana...

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