A toy car travels on a circular track at a constant speed of 0.50 m s –1. It passes a point on thetrack at time t = 0 and takes a time of 40 s to travel once around the track.The magnitude of the average velocity of the car between t = 0 and t = 20 s is v20.The magnitude of the average velocity of the car between t = 0 and t = 40 s is v40.What are v20 and v40?v20 / m s –1 v40 / m s –1A 0.32 0B 0.32 0.32C 0.50 0D 0.50 0.50
Question
A toy car travels on a circular track at a constant speed of 0.50 m s –1. It passes a point on thetrack at time t = 0 and takes a time of 40 s to travel once around the track.The magnitude of the average velocity of the car between t = 0 and t = 20 s is v20.The magnitude of the average velocity of the car between t = 0 and t = 40 s is v40.What are v20 and v40?v20 / m s –1 v40 / m s –1A 0.32 0B 0.32 0.32C 0.50 0D 0.50 0.50
Solution
The average velocity of an object moving in a circular path is zero when it completes one full round because the displacement is zero (it comes back to the starting point).
Given that the toy car takes 40 seconds to complete one round, the average velocity v40 at t=40s is 0 m/s.
However, at t=20s, the car is at the opposite point on the circular track. The displacement is equal to the diameter of the circle. But we don't have the radius of the circle, so we can't calculate the exact value of v20. But we know that it's not zero (because there is displacement) and it's not 0.50 m/s (because the speed is constant and the car hasn't completed a full round yet).
So, the answer is A: v20 = 0.32 m/s and v40 = 0 m/s.
Similar Questions
A car travels with a velocity of 80 km/h during the first half of its running time and then travels in the same direction at 40 km/h during the other half. Find the magnitude of the average velocity of the car.
A horse follows a dangling carrot for 20 m, if it took her 50 seconds to reach it, what was her average velocity?2 marks1,000 m/s2.5 m/s0.4 m/s20 m/s
A car travelling on a straight road in the same direction covers half a distance at a uniform velocity of 80 km/h and the other half of the distance travelling uniformly at 40 km/h. What is the magnitude of average velocity over the total period of motion?
A car traveling at 20 m/s reaches 60 m/s in 4 seconds traveling in a straight line. The car has an average acceleration of m/s2.
A car runs at a constant speed on a circular track of radius 100 m100 m taking 62.8 s62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively, isA0, 00, 0B0, 10 m s−1 0, 10 m s-1 C10 m s−1, 10 m s−110 m s-1, 10 m s-1D10 m s−1, 0
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.