Work and Energy...

A body of mass 6 kg is under a force of 6 N which causes displacement in it given by $$S =\frac{t^2}{4}$$ where 't' is time in seconds. The work done by the force in 2 s is:

When the force retards the motion of a body, the work done is:

An air conditioner is rated 240 V, 1.5 kW. The air conditioner is switched on 8 hours each day. What is electrical energy consumed in 30 days?

The correct formula to find the velocity of a body with kinetic energy '$$k$$' is:

A $$2kg$$ object is moving at $$3m/s$$. A $$4N$$ force is applied in the direction of motion and then removed after the object has travelled an additional $$5m$$. The work done by this force is:

$$1$$ kilowatt hr $$=$$ __________ joules.

$$1 Wh$$ (Watt hour) is equal to :

A bicyclist comes to a skidding stop in $$10 m$$. During this process, the force on the bicycle due to the road is $$200N$$ and is directly opposed to the motion. The work done by the cycle on the road is

Kinetic energy of a body depends upon its:

A block of weight $$W$$ is pulled a distance $$l$$ along a horizontal table. The work done by the weight is