A train takes 1 hour to go from one station to the other. It travels at a speed of 30kmh-1 for first half hour and at a speed of 50 kmh-1 for the next half hour. The average speed of the train is:
Correct answer: B. 40 kmh-1
- A. 45 kmh-1
- B. 40 kmh-1
- C. 35 kmh-1
- D. 30 kmh-1
Explanation
To find the average speed, we first calculate the total distance. The train travels for the first half hour at 30 kmh-1, covering a distance of 15 km. Then, it travels for the next half hour at 50 kmh-1, covering a distance of 25 km. Adding these, the total distance is 40 km. Since the total time is 1 hour, the average speed is calculated as total distance divided by total time: 40 km / 1 hour = 40 kmh-1. The other options are incorrect as they either imply a different total distance or time that does not match the given data.
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: