和动能和功有关的一道物理题虽然是英文的,但是题不是很难,答案要理由.You slam on the brakes of your car in a panic,and skid a certain distance on a straight,level road.If you had been traveling twice as fast,what distance would the car have skidded,under the same conditions?A.It would have skidded 4 times farther.B.It would have skidded twice as far.C.It would have skidded 1.4 times farther.D.It is impossible to tell from the information given.正确的是D,但我不知道为什么
问题描述：
和动能和功有关的一道物理题
虽然是英文的,但是题不是很难,答案要理由.
You slam on the brakes of your car in a panic,and skid a certain distance on a straight,level road.If you had been traveling twice as fast,what distance would the car have skidded,under the same conditions?
A.It would have skidded 4 times farther.
B.It would have skidded twice as far.
C.It would have skidded 1.4 times farther.
D.It is impossible to tell from the information given.
正确的是D,但我不知道为什么
答
由题意知速度加倍加速度不变末状态静止 根据公式v^2=2as 答案应该是a 不知道是不是我题意理解的不对的缘故 会不会是答案看错了？
答
要不然是什么?
这和初速度、动摩擦因数有关,题目里都没有给出啊