A truck of mass 5 tons is travelling on a horizontal road with 36 km `hr^-1` stops on travelling 1 km after its engine fails suddenly. What fraction of its weight is the frictional force exerted by the car of mass 1 ton i.e., car moving with same speed stops in similar distance, how much will the fraction be?

Consider a car moving along a straight horizontal road with a speed of 36 km/h. If the coefficient of static friction between road and tyers is 0.4, the shortest distance in which the car can be stopped is (Take g=10 m//s2)

An automobile travelling with a speed of 60 km h^-1 can apply brakes to stop after covering a distance of 20 m. If the car is going iwit as fast i.e., 120 km h^-1 , the stopping distance will be

A car with speed 60 km/h takes 8 hours to travel some distance. What should be the increase in the speed, if the same distance is to be covered in 7 1/2 hours?

A train A is travelling at a speed of 108 km hr^(-1) . The train approaches another train B standing on the platform. The engine of the train B blows its hom. The frequency of the horn as observed by the driver in train A is 504 Hz. The frequency of the hom of train B is (speed of sound = 330 ms^(-1) )

A car moving along a straight road with a speed of 120 km//hr is brought to rest by applying brakes. The car covers a distance of 100 m before it stops. Calculate (i) average retradation of the car. (ii) time taken by the car to come rest.

A car moving along a straight road with a speed of 120 km/hr, is brought to rest by applying brakes. The car covers a distance of 100 m before it stops. Calculate (i) the average retardation of the car (ii) time taken by the car to come to rest.

A satellite is going in a circular orbit of radius 4 xx 10^5 km around the earth has a certain speed. (b) What will be the ratio of the weight of a body on the surface of Mars to tyhe weight of the same body on the surface of the earth? The masses of earth and Mars are in the ratio 10:1 and their radii are in the ratio 2:1