The velocity of a motor car of mass 120 kg in increased from 36km/ hour to 72 km/hour. Find the change in momentum.

The speed of a car weighing 1500 kg increases from 36 km/h to 72 km/h uniformly. What will be the change in momentum of the car?

A motor car travelled 100 km at a velocity of 40 km/h and come back with a velocity of 25 km/h. Find the average speed.

Formulate the following problems as a pair of equation,and hence find their solutions: (i) Ritu can row downstream 20 km in 2 hours,and upstream 4 km in 2 hours.Find her speed of rowing in still water and the speed of the current.

A train travels a distance 300km at a uniform speed.If the speed of the train is increased by 5km an hour,The journey would have taken to two hours less.Find the original speed of the train.

A train travels at a certain average speed for a distance of 63 km and then travels a distance of 72 km at an average speed of 6km/hour more than its original speed. lf it takes 3 hours to complete the total journey, what is its original average speed?

A scooter of mass 120 kg is moving with a uniform velocity of 108 km/h. Calculate the force required to stop the vehicle in 10 sec.

What is escape velocity? Find an expression for the escape velocity of a body when projected from the surface of the earth. Show that the escape velocity form the earth's surface is about 11.2 km/sec.

The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minitues when the car is traveling at the speed of 66 km per hour.

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h ^-1 . Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km h^-1 . What is the magnitude of average velocity.

The driver of a three-wheeler moving with a speed of 36 km/ h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.