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从 100 m 自由落下的石头高度为 h(t) = 100 - 5t^2 。 [0, 2] 区间内的平均速度? [2, t_落] 区间内(如果在 击地)?
从 100 m 自由落下的石头高度为 h(t) = 100 - 5t^2 。 [0, 2] 区间内的平均速度? [2, t_落] 区间内(如果在 击地)?
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