﻿ A block of mass 10 kg, moving in the x-direction with a constant speed of 10 ms-1 , is subjected to a retarding force F= 0.1x J/m during its travel from x = 20 m to 30 m. Its final KE will be from Physics Work, Energy and Power Class 11 Manipur Board

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A block of mass 10 kg, moving in the x-direction with a constant speed of 10 ms-1 , is subjected to a retarding force F= 0.1x J/m during its travel from x = 20 m to 30 m. Its final KE will be

• 475 J

• 450 J

• 275 J

• 250 J

A.

475 J

From work energy theorem
work done = change in KE

⇒ W = Kf -Ki

From work energy theorem
work done = change in KE

⇒ W = Kf -Ki

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What are different units of energy?

The different units of energy are :

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(iii) eV
(iv) KWh
(v) Calorie.

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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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