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?

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

Momentum of an object changes from 100 kg m/s to 200 kg m/s in 2 seconds. What is the force applied to it?

A car covers first half of the distance between two places at a speed of 40 km/hr and the second half at 60 km/hr. What is the average speed of the car?

In a harbour, wind is blowing at the speed of 72 km/h and the flag on the mast of a boat anchored in the harbour flutters along the N-E direction. If the boat starts moving at a speed of 51 km/h to the north, what is the direction of the flag on the mast of the boat?

A jet aeroplane travelling at the speed of 500 km/h ejects the burnt gases at the speed of 1200 km/h relative to the jet aeroplane. Find the speed of the burnt gases w.r.t. a stationary observer on earth.

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.

Two cars A and B race each other. The Car A ran for 2 minute at a speed of 7.5 km/h, slept for 56 minute and again ran for 2 minute at a speed of 7.5 km/h. find the average speed of the car A in the race.

A car travelling due north at 20 km/hr turns west and travels at -the same speed. What is the change in 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.