SOLUTION: Ann is driving down a street at 55km/h. Suddenly a child runs into the street. If it takes Ann 0.75 s to react and apply the breaks, how many meters will she have moved before she

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Question 536227: Ann is driving down a street at 55km/h. Suddenly a child runs into the street. If it takes Ann 0.75 s to react and apply the breaks, how many meters will she have moved before she begins to slow down?
Answer by fcabanski(1391) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT where r is the rate (speed) and T is the time. The speed is given in km/h while the time for Ann's reaction is given in seconds.


Convert km/h to km/s.


There are 60 seconds in a minute and 60 minutes in an hour = 3600 seconds in an hour. Divide km/h by 3600 s/h to get km/s. ---> km/(h*s/h) = km/s.


55/3600 = .01528 km/s.


D = .01528*.75 = .01146km. Convert to meters with 1000 m/km (multiply).


.01146*1000 = 11.46 meters before the car even begins slowing.



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