有個物理問題想請教各位前輩，想了很久還是想不出來！
If a rock is thrown upward on the planet Mars with a velocity of 10 m/s,
its height in meters seconds later is given by y=10t-1.86t2 .
Find the average velocity over the time interval [1, 2].
答案是3.38
為何？
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