Work And Energy...

The work is said to be done, when

The formula to calculate work done `W` is

Which of the following statements is correct for a freely falling body?

What is the angle between displacement and the force applied when the work done is maximum?

Which of the following is vector quantity?

Which of the following statements is correct?

If an object of mass 1 kg is lifted to a vertical height of 1 m, work done is

A stone of mass m falls from a vertical distance h, the decrease in gravitational potential energy is

Two bodies of equal mass move with uniform velocities of V and 2V, respectively. Find the ratio of their kinetic energies.

What must be the velocity (in ms^-1) of a moving body of mass 2 kg, which possesses a kinetic energy of 16 J?

Calculate the work done in lifting 100 kg of water through a vertical height of 3 meter. (Assuming g = 10 m/s²)

A dry cell converts one form of energy into another.Which of the following options depicts the two forms?

Which of the following statements is not true?

Which of the following physical quantities has its units Watt?

Which of the following options is correct?

How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?

A ball of mass 200 g falls from a height of 5 m. What is its kinetic energy, when it just reaches the ground? (g = 9.8 m/sec²)

Two bodies A and B of equal masses are kept at height of h and 2h respectively. What will be the ratio of their potential energies?

What is the power of an engine which is capable of doing 10,000 J of work in 10 minutes?

When we compress a coil spring, the elastic potential energy