contestada

If you lift two loads up one story, how much work do you do compared to lifting just one load up one story?

A) One half as much
B) One quarter as much
C) The same amount
D) Twice as much
E) Four times as much

Respuesta :

Answer:a

Explanation:

We have to lift the load two loads up one story, so energy required is

let m be the mass of each load and h is the height of each story

Energy [tex]E_1=2\times m\times g\times \h[/tex]

[tex]E_1=2mgh[/tex]

Here energy gained is the potential energy which depends upon the datum(floor).

For lifting one load up one story

Energy required

[tex]E_2=mgh[/tex]

thus [tex]E_2[/tex] is half of [tex]E_1[/tex]

So option a is correct                                

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