A particle moves along the sides AB, BC, CD of a square of side 25 m with a velocity of 15 m/s. Its average velocity is
Correct answer: D. 5 m/s
- A. 15 m/s
- B. 10 m/s
- C. 7.5 m/s
- D. 5 m/s
Explanation
The average velocity is defined as the total displacement divided by the total time taken. In this problem, even though the particle travels around three sides of a square, the displacement is simply the straight-line distance from the starting point (A) to the endpoint (D), which is one side of the square, or 25 m. The time taken to travel along the three sides is calculated by dividing the total distance traveled (75 m) by the speed (15 m/s), resulting in 5 seconds. Therefore, the average velocity is calculated as:Average velocity = Total displacement / Total time = 25 m / 5 s = 5 m/s.Other options incorrectly assume different relationships between the distance, displacement, or time, or confuse average speed with average velocity.
Last updated
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
(1, 1, 1) . (2, 2, 2)
1st law of motion gives the definition of:
2nd law of motion measures which quantity?
7.0 kg bowling ball experience a net force of 5.0N. What will be its acceleration?
A 0.2 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30m/s and rebounds up at 20m/s. The impulse on the ball during the collision is: