What is the average speed of the ball? A) 2m/s B) 2m/s C) 72m/s D) 12 m/s

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because if the tool that you are using is not balanced it there would be false mass.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

answer///isobars;