想請教大大一題物理，
因為看不懂題意，卡關好久，GOOGLE大神也只幫忙找到付費網站的解答@@
拜託各位大大了！
題目如下：
A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s.
At this time, the driver suddenly realizes that she must stop the car.
If it takes 0.200 s for the driver to apply the brakes,
what must be the magnitude of the constant acceleration of the car after
the brakes are applied so that the car will come to rest at the stop sign?
只能選擇一個：
a. 2.08 m/s^2
b. 4.17 m/s^2
c. 3.42 m/s^2
d. 3.89 m/s^2
e. 2.89 m/s^2