# Physics

Consider a circular track with a radius of 200 meters. A runner starts on the east side and runs around the track to a point diametrically opposite her starting point.

-What is the magnitude of her displacement?
400m

-She then runs the rest of the way around the track to complete full lap. What is the magnitude of her total displacement after she has returned to her starting point?
0m

-Suppose the runner takes 2 minutes to run from her starting point to the opposite side of the track. What is the magnitude of her average velocity over the 2 min interval?
100m/min.

-What is her average speed over the same interval?
200m/min

1. 👍 0
2. 👎 0
3. 👁 1,021
1. correct

1. 👍 0
2. 👎 0
2. Thanks! so the 100m/min is right?

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Trig/Pre-Calc...

Please help me with this. The finishing time for a runner completing the 200-meter dash is affected by the tail-wind speed, s. The change, t, in a runner's performance is modeled by the function shown below: t= 0.0119s^2 - 0.308s

asked by AbelovedAngel on October 23, 2014
2. ### Precalc

Water is flowing from a major broken water main at the intersection of two streets. The resulting puddle of water is circular and the radius r of the puddle is given by the equation r = 5t feet, where t represents time in seconds

asked by Zoe Cameron on April 2, 2015
3. ### PHysics!!

Starting from rest at a height equal to the radius of the circular track, a block of mass 25 kg slides down a quarter circular track under the influence of gravity with friction present (of coefficient μ). The radius of the track

asked by Bob on May 8, 2012
4. ### phyics

Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average velocity of the runner. Express your answer in meters per second to the nearest integer.

asked by shelby on September 12, 2015
5. ### physics

1.Moving with uniform acceleration a body covers 150m during 10sec so thet it covers 24m during the 10th sec .What is the initial velocity and the acceleration of the body. 2.A runner travels 1.5 laps around a circular track of

asked by srikar on May 19, 2012
1. ### College Calculus 1

A runner sprints around a circular track of radius 150 m at a constant speed of 7 m/s. The runner's friend is standing at a distance 300 m from the center of the track. How fast is the distance between the friends changing when

2. ### Physics

Cheryl runs a race on a 400.0 m circular track. She starts running east of the starting line and then circles the track and falls, stopping 1.00 m west of the starting line. Her time is 80.0 s. What was her average velocity? I

asked by Pat on January 9, 2012
3. ### calculus

Two runners, A and B run on a straight race track for 0

asked by Kenneth on November 22, 2008
4. ### math

There is a diagram of a running track. The track is made up of two straights and two semicircles. The radius of each semicircle is 35 meters. The length of the outer perimeter of the entire running track is 400 meters. Find the

asked by Melanie on May 19, 2016
5. ### physics

a runner run halfway around a circular track whose radius is 60 meters in 45 secs what is the average velocity? what is the average speed?

asked by Dan on October 16, 2011
6. ### physics

a race car starts from rest on a circular track.the car increases its speed at constant rate at as it goes 2.75 times around the track.find the angle that the total acceleration of the car makes with the radius connecting the

asked by abera on November 21, 2014