Physics, 23.04.2020 16:32, Roro7522

A person driving a car suddenly applies the brakes. The car takes 4 s to come to rest while traveling 20 m at constant acceleration. Can the speed of the car immediately before the brakes were applied be determined without first determining the car's acceleration? )

A. Yes, by dividing the distance (20 m) by the time (4 s).
B. Yes, by determining the average speed while braking and doubling it.
C. No, because the acceleration is needed to use standard equations such as Ax= v. t + 1/2 at
D No, because the fundamental relationship that defines velocity contains acceleration.

Answers: 1

Show answers

Other questions on the subject: Physics

Physics, 22.06.2019 10:00, yasminlockser6

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Answers: 2

continue

Physics, 22.06.2019 13:00, caleb1009

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Answers: 3

continue

Physics, 22.06.2019 17:00, davinedmcneal

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.

Answers: 1

continue

Physics, 22.06.2019 18:30, violetvinny

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?

Answers: 1

continue

Do you know the correct answer?

A person driving a car suddenly applies the brakes. The car takes 4 s to come to rest while travelin...