An object 16.8 cm tall is placed in front of a converging lens. A real image, 46 cm tall, is formed on the other side of the len
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First of all, we need to calculate the work done by the forklift to lift the box of 500 kg by 4 meters. The work done is equal to the variation of gravitational potential energy of the box, given by:
where m=500 kg is the mass of the box,
and 
is the variation of height of the box. Substituting these data into the equation, we find the work
And now we can calculate the minimum power required by the forklift, which is equal to the ratio between the work done and the time taken:
where m=500 kg is the mass of the box,
And now we can calculate the minimum power required by the forklift, which is equal to the ratio between the work done and the time taken: