A 50 kg crate is lifted to a height of 10 meters how much potential energy does the create have after ?

Question

being lifted ? if it took 5 seconds to lift the create ,using a machine, what was the power rating of the machine?

Answer 1

PE = mgh so here

PE= 50 kg x 10 m x 9.8 m/s/s =

4900 Joules

Power = Work/time = 4900J/5s=

980 Watts

Answer 2

The change in potential energy is mass times gravity times change in height.

PE = mgh

m = 50kg

g = 9.8 m/s^2

h = 10 m

Also note that the unit of enery Joules J = kg m^2 / s^2

Once you have the energy in Joules, the power needed to lift the crate is Energy divided by Time:

P = E / t

E = Your answer from above

t = 5s

And the unit of energy Watts is W = J / s