A car moving at 41.66 mph approaches an intersection and the driver observes the light go yellow. The driver's reaction time is 0.64 s. If the car can brake at a maximum acceleration of -3 m/s2, what is the minimum stopping distance in feet?
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- A student drives 40 km south in an attempt to get to a science fair competition before realizing he missed the exit. He turns around and drives back north 15 km before arriving. The total time of travel was 0.75 hr. What is his speed? What is his velocity?Suppose a car is traveling at +24.3 m/s, and the driver sees a traffic light turn red. After 0.219 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 4.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first notices the red light?A car is traveling at a steady 77 km/h in a 50 km/h zone. A police motorcycle takes off at the instant the car passes it, accelerating at a steady 7.2 m/s2 . How much time elapses before the motorcycle is moving as fast as the car? How far is the motorcycle from the car when it reaches this speed?
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- A pickup truck is traveling at 30.0 m/s. The driver of the truck applies the brakes and gives the truck a uniform deceleration of 6.50 m/s2² while it travels 20.0 m. What is the speed of the truck in m/s at the end of this distance?Suppose a car is traveling at +21.4 m/s, and the driver sees a traffic light turn red. After 0.511 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 5.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first notices the red light?A car is traveling at a steady 81 km/h in a 50 km/h zone. A police motorcycle takes off at the instant the car passes it, accelerating at a steady 8.4 m/s2 . How much time elapses before the motorcycle is moving as fast as the car?
- While traveling at 56.14 km/h, a driver drops her cell phone on the floor of the car. She reaches down to pick it up and is not looking ahead for 2.75 seconds. How far did the car travel during this time?A car traveling at 16.8 m/s is 20.7 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.54 s later. What was the acceleration of the car? Be careful to get the sign correct! Express your answer in m/s? to 3 significant figures.A train is moving up a steep grade with constant velocity. The caboose breaks loose and starts rolling freely. After 4.12 seconds, the caboose is 36.6 meters behind the train. What is the magnitude of the acceleration of the caboose in m/s2?