# physcial science

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a 50 kg crate is lifted to a height of 10 meters.

a. how much potential energy does the crate have after being lifted?

b. if it took 5 seconds to lift the crate, using a machine what was the power rating of the machine?

• physcial science -

a) Work = Force x Distance

The Force in this case is Mass*(acceleration of gravity), so
Work = 50 kg*9.8 m/s^2*10 m = __ Newtons

b) Power = Work/Time

• physcial science -

one half second after starting from rest, a free falling oblect will have a speed of about what?

• physcial science -

homogeneous mixture

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