Hey there!
A ball rolls 3 times. If she adds the three measurements and divides it by 3, it means that this is the average speed. The average speed is found by adding all measurements and dividing by the amount of numbers.
I hope this helps!
Acceleration is a change in speed, so if the car has a constant speed then it's acceleration is 0m/s^2.
<u>Answers</u>
Line 1: The spacing is the same. Uniform
Line 2: The spacing is increasing.
Line 3: The spacing is decreasing.
<u>Explanations</u>
The dots seems to be the one made by a ticker tape timer. A device that used to find the velocity/acceleration of bodies at a short distances.
Line 1
When you look at the space between the dots in line 1, you will see that the gaps are uniform. The distances between the dots are the same. If the dots were from a ticker time, then it would represent a constant velocity.
Line 2
The spaces from the left are be coming bigger as you move to the right. That is the spacing is increasing. If it is from a ticker time, these would represent an increasing velocity.
Line 3
The spaces are decreasing from left to right. That is the distance is becoming smaller. For a ticker timer is could mean a decreasing the velocity.
Answer:
Ac = v²/r
where, Ac is centripetal acceleration
v is velocity
r is radius
5 = (20)²/r
r = 400/5
r = 80m
from,
w = 2πf
where, w = angular velocity and f frequency
w = v/r
f = n/T
then,
v = <u>2πrn</u><u> </u>,n = 1 to complete 1 cycle
T
T = 2πr/v
T = 2π*80/20
T = 25.14seconds.
The car would take 25.14s to complete 1 cycle of the roundabout.