[]

  ?????é???????à??????????????????

  ?????????ú?????ú?????????é?????????á???????????¨????

  ??????????????????????

  ????×?????×·??????????????????????

  ????????°?????????????×??????????·??

  ?????????????ì??????????±??¨·??§??°???

  ???????????°????????????×???????????????

  ???¨??????°×??????

  ?????????÷×?????????????·??????????????ó????

  ?????????·??17?????????????à?·???à????????30?ò?×??

  ·???55m/s???ó????101325kpa??????????0???ó????×????????????????????±????

  ??????????V0=0

  ??????V??gt

  ????????h=gt2/2

  ????±??????ú?????????ó?±????

  ?????????(????? )?í??

  ??????????????ê?í?????????????????·?????

  ?°???????????¨?????????????????????????¨???????????????¨?????±

  ????????????????·???????????????°??ó?????????????????????±??±????±????

  ??????????????????????????????????

  ???§????°×??°???

  ???????????????????±??????????·???????????

  ?±??°???????×????????????????·?±?á????????????

  ?????÷?ó???????ú???ú???????????ò??????

  |?? ???)?

  ??????±???×?????

  ???????ù×???????????±?????°?±??????è?ù???????ó??×??ú??à?à????????è??°???

  ?????·×????????????????????·??????×?????????

  ??????×????·????????????

  ?é???????????????????????????à??????

  ?????????·???????ü???????????????±?÷?é????????±??¨??

  ??-`????-

  ???????????????????????????°??±????????¨°×??

  ??????°???????????????·è?????ù?????????·??

  ??????????·???????±??¨?±???????à?±?????§?ò??TNT?±????

  ???±??·??????ò?×±????ò?????????·?????÷?¨??????????????????????×?????°?·???????????

  ?°?????±

  ???ù???ì????????±§????????±????÷?¨?¨??????????

  ????±????é??????????????????

  ??(??||(????(???????)??

  ×??°??×???????????????

  (?)?(?d)?°°??????????????????????±

  ±??¨?????÷??????????????×ù?????????????ó·???????

  ?????????????????ó??????????

  ???§??????à??????????ü?à??????????±?????????????

  ??????±??????????·????°×????°???

  ???????????¨??×???°???

  ?????··???±????÷?¨????±????????ó??????????????×?±??¨??

  ?°?í?????????ù°????ú????????????????·¨±?°????±

  ???§×??°???·±????????????????????ù??

  ???????ó????????

  ±??¨?à?¨???????é?????à?????§?à???ó?????ì???????????????é??????

  ???í±?÷???????·?×??ó?ó??????

  
  ???±??±???????????????????????????????

  ?????ú????????????????????????±????ó??????????

  ???????????????ü?????????????????????????????ù????

  ???í?????é?????é???????????±??±??????¨??°?×?????

  ??×??????????????ú????????

  
  ??????????????

  ????????????°????????ü????????????????°???

  ????????????????????????????????????????

  ??×??????????????§????????????·?×ê???????????±?????¨·?°???

  ?°×????????????±

  ???????±?±????×??ó????±??¨????????????????

  ·è?????é?é???ì????????????

  ??????×???????????×????????¤???°???ó?????????????????????????±

  ?????????????????°????????±?????°?????±??ì?????????±

  ??????×???????×????é?é????????±í?é????????°???

  ??×???±?×??????????????à?????????é?é????

  ×???????????°??à?????????ú?ú??

  ???????±????×?±?°??í?°???????é?é?????????±?ò??

  ???§?ó?????°?????????????????????÷?????????±

  ????????????×÷???±???????°???¨???