In an action-adventure film, the hero is supposed to throw a grenade from his car, which is going 71.0km/s , to his enemy's car, which is going 124km/s . The enemy's car is 14.8m  in front of the hero's when he lets go of the grenade.

1.   If the hero throws the grenade so its initial velocity relative to him is at an angle of 45度  above the horizontal, what should the magnitude of the initial velocity be? The cars are both traveling in the same direction on a level road. You can ignore air resistance.
求vo?  =    km/h


2.   Find the magnitude of the velocity relative to the earth  
求vo?  =    km/h  


我快爆炸了
= = '' ' ' '  
   

感謝不盡!

[ 本帖最後由 heronathan123 於 2008-10-11 01:30 編輯 ]

有中文版嗎
是要解物理還數學