Answer to Question #80325 in Mechanics | Relativity for joco poko

Question

1. A 745i BMW car can brake to a stop in a distance of 12 ft. from a speed of 60.0 mi/h. To brake to a stop from a speed of 80.0 mi/h requires a stopping distance of 211 ft. What is the average braking acceleration for (a). 60 mi/h to rest, (b). 80 mi/h to rest (c). 80 mi/h? Express the answers in mi/h/s and in m/s squared.

2. In a 100-m linear accelerator, an electron is accelerated to 1.00% of the speed of light in 40.0 before it coasts for 60.0 m to target. (a). What is the electron's acceleration during the first 40.0 m? (b). How long does the total flight take?

3. A jet plane lands with a speed of 100 m/s and can accelerate at a maximum rate of- 5.00 m/s squared as it comes to rest. (a) From the instant, the plane touches the runway, what is the minimum time interval needed before it can come to rest? (b). Can this plane land on a small tropical island airport where the runway is 0.800 km long?