Hot air balloon A is rising upward at a rate of 10.0 m/s. A passenger aboard balloon A observes balloon B going down at a relative rate of 12.5 m/s. What is the velocity of balloon B relative to the ground? Assume that up is positive.
−2.5 m/s
2.5 m/s
22.5 m/s
-22.5 m/s
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and your answer?
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