An object with mass 'm' moving with velocity 'V' has kinetic energy of \( \frac{1}{2}\,mv^2\) . In order to bring it to rest, its velocity has to be reduced to zero, and in order to accomplish that, the kinetic energy has to be drained off and sent somewhere else. An external force has to absorb energy from the object, i.e. do negative work on it, equal to its kinetic energy, or

\( \frac{-1}{2}\,mv^2\).

Answered by Shivani Kumari | 2 years agoIllustrate the law of conservation of energy by discussing the energy changes

which occur when we draw a pendulum bob to one side and allow it to oscillate. Why

does the bob eventually come to rest? What happens to its energy eventually? Is it a

violation of the law of conservation of energy?

The volume of a 500 g sealed packet is 350 cm^{3} . Will the packet float or sink in water if the density of water is 1 g cm^{-3} ? What will be the mass of the water displaced by this packet?

The volume of 50 g of a substance is 20 cm^{3} . If the density of water is 1 g cm^{-3} , will the substance float or sink?

Why a block of plastic does released under water come up to the surface of water?

In what direction does the buoyant force on an object immersed in a liquid act?