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

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) (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.

I provide online tutoring ($30/hr) and personal problem solving
($3.50-$5.50 per problem. Contact me (check the profile "website" which is
my email address.

RELATED QUESTIONS
Ann is driving down a street at 57 km/h. Suddenly a child runs into the street. If it... (answered by jorel1380)

ann and bob move towards eachother along a straight road. Ann goes with a constant speed... (answered by solver91311)

4. Ann and Becky run on a straight track. Ann starts 10m ahead of Becky, and runs at a... (answered by ikleyn,Alan3354)

Elliott street is 24ft wide when it ends at main street in brattleboro, vermont, a 40 ft (answered by ankor@dixie-net.com,KMST)

Patricia lives in a house on a hill. The grade of her street is 9%. The street ends at... (answered by ankor@dixie-net.com)

Ann is driving a motorboat across a river that 2 km wide. The boat has a speed of 20 km/h (answered by Theo)

Your small dog gets away from you and begins running down the street. If your dog is... (answered by Alan3354)

hi! im having some problems with my word problem. Ann regularly swam .4 km in 20... (answered by ankor@dixie-net.com)

Ann and Tom took turns driving for a total of 10 hours. On average, Ann drove at 65mph... (answered by josgarithmetic,richwmiller)