# Physics

I just need help with part c. I know stopping takes longer but we have to explain why.

A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 849 N.

(a) As the elevator moves up, the scale reading increases to 912 N. Find the acceleration of the elevator.
0.73 m/s^2

(b) As the elevator approaches the 74th floor, the scale reading drops to 782 N. What is the acceleration of the elevator?
-0.77 m/s^2

(c) Using your results from parts a and b, select which change in velocity, starting or stopping, takes the longer time.

1. 👍
2. 👎
3. 👁

## Similar Questions

1. ### physics

You are driving through town at 12.0 m/s when suddenly a ball rolls out in front of you. You apply the brakes and begin decelerating at 3.7 m/s2 . part A=How far do you travel before stopping? part B= When you have traveled only

2. ### math

If a car is speeding down a road at 40 (mph), how long is the stopping distance compared to the stopping distance if the driver were going at the posted speed limit of 25 ? Express your answer as a multiple of the stopping

3. ### Math

the stopping distance of an automobile is directly proportional to the square of its speed v. a car required 90 feet to stop when its speed was 70 miles per hour. find a mathematical model that gives the stopping distance d in

4. ### physics

Assume that the brakes in your car create a constant deceleration of 3.1 m/s2 regardless of how fast you are driving. part A= If you double your driving speed from 17 m/s to 34 m/s , does the distance required to come to a stop

1. ### intro to physics

an athlete executing a long jump leaves the ground at a 28 degree angle and lands 7.6 m away. part a )what was the takeoff speed ? part b) if this speed were increased by just 8.0% , how much longer would the jump be ? for part a)

2. ### Physics

A race car can be slowed with a constant acceleration of -11 m/s^2 a. If the car is going 55 m/s, how many meters will it travel before it stops? b. How many meters will it take to stop a car going twice as fast? According to one

3. ### Algebra

On the first part of a trip to Carmel traveling on the​ freeway, Marge averaged 70 mph. On the rest of the​ trip, which was 25 mi longer than the first​ part, she averaged 60mph. Find the total distance to Carmel if the

4. ### physics

You are driving through town at 12.0 m/s when suddenly a ball rolls out in front of you. You apply the brakes and begin decelerating at 3.5 m/s^2.(a)How far do you travel before stopping?(b)When you have traveled only half the

1. ### Physics

A turbine is spinning at 3600rpm . Friction in the bearings is so low that it takes 11min to coast to a stop. How many revolutions does the turbine make while stopping?

2. ### Algebra

The stopping distance D in feet for a car traveling at x miles per hour is given by d(x)= (1/12)x^2+(11/9)x. Determine the driving speeds that correspond to stopping distances between 300 and 500 feet, inclusive. Round speeds to

3. ### algebra

It takes Ross, traveling at 24 mph, 10 minutes longer to go a certain distance than it takes Evelyn traveling at 30 mph. Find the distance traveled

4. ### Physics

A car is traveling at 54.2 km/h on a flat highway. The acceleration of gravity is 9.81 m/s^2. PART 1: If the coefficient of kinetic friction between the road and the tires on a rainy day is 0.131, what is the minimum distance