请教一道高中物理作业题, 请勿见笑，本人物理当年没学好

[Jenny_Hull]

A spaceman of mass 100kg is stranded 2m from his spaceship. He happed to be holding a hammer of mass 2kg what must he do? If he only has enough air to survive for 2 minutes, how fast must he throw the hammer if he is to get back in time? is it possible?

 

[uglyducking]

A spaceman of mass 100kg is stranded 2m from his spaceship. He happed to be holding a hammer of mass 2kg what must he do? If he only has enough air to survive for 2 minutes, how fast must he throw the hammer if he is to get back in time? is it possible?

开舱门需要时间吗？

 

[一村民]

太空这东西不懂。

 

[Jenny_Hull]

开舱门需要时间吗？

应该忽略不计

 

[好玩儿]

在太空中应该是所有其他力都忽略。
所以应该用动量守恒定律来做。

 

[好玩儿]

我很无聊帮你做完吧。
设扔hammer的速度是u，人的返回速度是v
100v=2u
接着要求2/v<=2*60,
这样可以解出u的最小值。
给钱。

 

[Jenny_Hull]

我很无聊帮你做完吧。

设扔hammer的速度是u，人的返回速度是v

100v=2u

接着要求2/v<=2*60,

这样可以解出u的最小值。

给钱。

谢谢，谢谢！

 

[一村民]

哈，给钱给钱。