A car covers first half of the distance between two places at the speed of 40km/h . And 2nd half at 60km/h. What the average speed of the car ?

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

A car travels a distance A to B at a speed of 40km/h and returns to A at a speed of 30km/h (i)what is the average speed for the whole journey (ii)what is the average velocity ?

A boy walks to his school at a distance of 6 km with constant speed 2.5(km)/h and walks back with constant speed of 4(km)/h . What is the average speed for the round trip in (km)/h

A body travels from a point P to point Q by the shortest route with a velocity of 50km/h and returns to P by the same route with a velocity of 70 km/h. What is the average speed ?

A particle travelling along a straight line traversed one third of the total distance with velocity 4m//s . The remaining part of the distance was covered with a velocity 2m//s for half of the time and with velocity 6m//s for the other half of the time. What is the average velocity for the whole motion.

The ratio between the root mean square speed of H_2 at 50k and that of O_2 at 800k is :

A particle is moving along a circular parth of radius 5m with uniform speed of 5m/s. What will be the average acceleration when the particle completes half revolution ?