math---differentiation2
2013-10-07 12:42 am
A car is traveling at 100ft/s when the driver suddenly applies the brakes (x=0, t=0). The position function of the skidding car is x(t)=100t-5t^2. How far and for how long does the car skid before it comes to a stop?
回答 (1)
2013-10-07 12:54 am
✔ 最佳答案
velocity = dx/dt = 100 - 10twhen it stop ==> v = 0; t=10
So. It stops when t=10
How far it moved
x(10) = 100(10) -5(10)^2
Do it yourself.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20131006000051KK00176