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Physics Questions 帮帮忙

ws0146

2013-7-8 08:28 PM

1.Salina is driving a velocity of 10 m/s.Seeing a cow in front.She brakes to stop her car.If the deceleration of the car is 2 m/s.What is the distance the car covers before it comes to a halt?

2.A grenade suddenly explodes and turns into two parts which travel to opposite direction.The mass of first part is three times of mass of second part.If the velocity of the first part is V1.What is thevelocity of the second part in terms of V2 ?

chungwei0730

2013-7-8 09:11 PM

1） v^2 = u^2+2 as
V =0 u=10 a=-2

2)0=3mv+m3v
V2=-v1 ?

第二个可能有问题

ws0146

2013-7-8 09:29 PM

chungwei0730 发表于 2013-7-8 09:11 PM
1） v^2 = u^2+2 as
V =0 u=10 a=-2

谢谢你啊^^

chungwei0730

2013-7-8 09:46 PM

S=ut + 1/2(a)(t^2)
S=24 u=0 t=3

1970-1-1 08:00 AM

kaze1231

2013-7-12 08:38 PM

有答案吗我想肯定下~~

lonewolfbird

2013-7-12 08:43 PM

中三的題目找中三的學生回答....

ws0146

2013-7-12 08:45 PM

kaze1231 发表于 2013-7-12 08:38 PM
有答案吗我想肯定下~~

没有喔==你把你的写下来让我好参考吧，谢谢

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