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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
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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

User Nulleight
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Haven't taken physics but I would assume if her friend is standing in front of her that you would add up the speeds and get 30 km/hr.
User Jenelle
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