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A warehouse worker uses a forklift to raise a crate of pickles on a platform to a height 2.75 m above the floor. The combined mass of the platform and the crate is 207 kg.
If the power expended by the forklift is 1440 W, how long does it take to lift the crate?

a) 37.2
b) 5.81
c) 3.87
d) 18.6
e) 1.86

Respuesta :

Answer:

correct option is c) 3.87

Explanation:

given data

height = 2.75 m

mass = 207 kg

power = 1440 W

to find out

how long it take to lift the crate

solution

we know that work done in raising the crate & platform

so

work done = change in potential energy that is

work done = mgh    ....................1

work done  =207 ×9.81 × 2.75

work done = 5584.3425 J

and we know power that is

power = [tex]\frac{work\ done}{time}[/tex]     .............2

1440 = [tex]\frac{5584.3425}{time}[/tex]

time = 3.878 s

so correct option is c) 3.87

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