College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 6

Assuming a reaction time of 0.50 s for the driver in Exercise, will the car stop before hitting the child
Exercise
The speed limit in a school zone is 40 km/h (about 25 mi/h). A driver traveling at this speed sees a child run onto the road 13 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of m/s 2. If the driver's reaction time is 0.25 s, will the car stop before hitting the child