E总 = (1/2)m30^2 = 450m
E势 = (2/3)E总 = mgH
所以 10mH = (2/3)450m
解得 H = 30
E动 = (2/3)E总 = (1/2)mV^2
所以 (1/2)mV^2 = (2/3)450m
解得 V = 10√6 (10√6指10根号6)
上面的 m 是上抛物体的质量
E总 = (1/2)m30^2 = 450m
E势 = (2/3)E总 = mgH
所以 10mH = (2/3)450m
解得 H = 30
E动 = (2/3)E总 = (1/2)mV^2
所以 (1/2)mV^2 = (2/3)450m
解得 V = 10√6 (10√6指10根号6)
上面的 m 是上抛物体的质量