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An electric motor raises a load of 0.2 k...

An electric motor raises a load of 0.2 kg, at a constant speed, through a vertical distance of 3.0 m in 2 s. If the acceleration of free fall is `10 m//s^(2)`, the power in W developed by the motor in raising the load is :

A

`0.3`

B

`1.2`

C

`3.0`

D

`6.0`

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The correct Answer is:
C
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
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  2. Which of the following energy change involves frictional force?

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  3. An electric motor raises a load of 0.2 kg, at a constant speed, throug...

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  4. An object is falling freely from a height x. After it has fallen a hei...

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  12. In loading a truck, a man lifts boxes of 100 N each through a height o...

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  15. When do we say that work is done ?

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  16. Write an expression for the work done when a force is acting on an obj...

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  19. What is the kinetic energy of an object ?

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  20. Write an expression for kinetic energy of an object.

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