8. A person travelling in a straight line moves with a constant velocity v1 for certain distance ’ x ’ and with a constant velocity v2 for next equal distance. The average velocity v is given by the relation

7. Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator. then the escalator takes her up in time t2. The time taken by her to walk up on the moving escalator will be:

6. A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed during the complete journey is

5. A car moves from X to Y with a uniform speed vu and returns to Y with a uniform speed vd. The average speed for this round trip is

4. If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s, it covers a distance of ?

3. A bus travelling the first one third distance at a speed of 10 km/h, the next one third at 20 km/h and the last one-third at 60 km/h. The average speed of the bus is ?

2. A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of distance at speed v. The average speed is 48 km/h. Find the value of v.

1. A car covers the first half of the distance between two places at 40 km/h and other half at 60 km/h. The average speed of the car is ?