Consider a car is travelling for one hour. Whuch of the following trips have the same average velocity?
Correct answer: B. car travels 40 km due east then turns around and travels 20 km due west and car travels 20 km due east
- A. car travels 20 km due east and car travels 70 km due west.
- B. car travels 40 km due east then turns around and travels 20 km due west and car travels 20 km due east
- C. car travels 40 km due east then turns around and travels 20 km due west and car travels 70 km due east
- D. car travels 30 km due west then turns around and travels 30 km due east and car travels 40 km due east, then turns around and travels 20 km due west
Explanation
Trip A displacement: 40 Km east then 20 km west, in vector form we can say that the car travels +40 then -20. So total displacement will be: +40-20=+20kmTrip B displacement: 200 km east or +20 kmso both are equal. When the displacements are equal and the time is also equal (1 hr), then the average velocity is also equal because V=S/t
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Displacement and Velocity questions
The displacement of objects with respect to a constant moving (v) frame in the same direction is?
The rate of change in displacement is known as?
The slope determined by drawing a right-angled triangle drawn with the tangent as the hypotenuse will be the same as?
Instantaneous velocity is defined as _.
If displacement-time graph is a curve, which of the following is correct:
The SI unit of velocity is _.