# Simon is riding a bike at 12 km/h away from his friend Keesha.He throws a ball at 5 km/h back to Keesha, who is standing still on a sidewalk.

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## Question:

Simon is riding a bike at 12 km/h away from his friend Keesha.He throws a ball at 5 km/h back to Keesha, who is standing still on a sidewalk.

How fast would Keesha say the ball is traveling toward her?

I notice that even though we’re working with frames of reference
here, you never said which frame the ‘5 km/hr’ is measured in.

In fact !  You didn’t even say which frame the ’12 km/hr’ of his
bike is measured in.

So there are several different ways this could go.  I’ll do it the way
I THINK you meant it, but that doesn’t guarantee anything.

— Simon is riding his bike at 12 km/hr relative to the sidewalk,
away from Keesha.

— He throws a ball at Keesha, at 5 km/hr relative to his own face.

— Keesha sees the ball approaching her at (12 – 5) = 7 km/hr
relative to the ground and to her.

From the answer and question examples above, hopefully, they could assist the student sort out the question they had been looking for and notice of the whole thing stated in the answer above. You can easily then have a discussion with your classmate and continue the school learning by studying the subject as a group.

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