題組內容
2. A rock thrown upward with velocity 16 ft/sec reaches height f=16t-16t² at time t.
(2) Find its average speed Δf/Δt from t = 
to t = 1 (5 points)
阿摩線上測驗
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(2) Find its average speed Δf/Δt from t = to t = 1 (5 points)