昔日的跳伞塔周边为沙地，以减缓着陆冲击。
用牛顿力学原理分析了跳伞降落、跳伞塔跳伞和高空跳伞的问题。
The problems of a parachute jump, parachuting from tower and from a great height are analyzed by Newton's mechanical principles.
用牛顿力学原理分析了跳伞降落、跳伞塔跳伞和高空跳伞的问题。
The problems of a parachute jump, parachuting from tower and from a great height are analyzed by Newton's mechanical principles.
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