問題詳情
39. A 5.0-kg ball is dropped from a cliff. Given the resistive force is R = (0.49 kg/m)v2, where v is thespeed of the ball, and the gravitational acceleration is g = 9.8 m/s2, what is the terminal speed theball?
(A) 4.9 m/s
(B) 10 m/s
(C)40 m/s
(D) 2.0 m/s
(E) 20 m/s
參考答案
答案：B
難度：計算中-1
書單：沒有書單，新增