﻿ Underline the correct alternative:(d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total energy of the system of two bodies.  from Physics Work, Energy and Power Class 11 Manipur Board

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Underline the correct alternative:

(d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total energy of the system of two bodies.

Total linear momentum

The total linear momentum always remains conserved, whether it is an elastic collision or an inelastic collision.
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Define watt.

Power is said to be one watt if one joule of work is done in one second.
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Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e. .

And dot product is a scalar quantity. Therefore, work is a scalar quantity.
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Define the unit joule.

Work done is said to be one joule if one newton of  force displaces the body through a distance of one meter in the direction of applied  force .
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What is watt?

SI unit of power is Watt.
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What are different units of energy?

The different units of energy are :

(i) Joule
(ii) Erg
(iii) eV
(iv) KWh
(v) Calorie.

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