Find the work done in in reasing the speed of car from `18 kmh^-1` to `36 kmh^-1` . Given, the mass of car is 1000 kg.

A car travels 4 km in 3 minutes. Find the speed of car in cms^-1

Calculate the work done by a car against gravity in moving along a straight horizontal road. The mass of the car is 400 kg and the distance moved is 2 m.

What is the amount of charge possessed by 1 kg of electrons? Given that mass of an electron is 9.1 xx 10^31 kg .

A train 100 m long is moving with a velocity of 60 kmh^-1 . Find the time it takes to cross the bridge 1 km long.

A potential barrier of 0.3 V exists across a P-N junction: If an electron with speed 4 xx 10^(5) ms^(-1) approaches this P-N junction from the N-side, the find the speed with which it will enter the P-side. Given mass of electron 9.1 xx10^(-31) kg

A motorcylist drives from A to B with a unit speed of 30 kmh^-1 and returns back with a of 20 kmh^-1 . Find its average speed.

A car is moving at a constant speed of 60kmh^-1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 kmh^-1 . In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2 s till the other car overtakes. If the two cars were maintaining thier speed, whihc of the following statement is/are correct?