A 4kg object is lifted to a height of 2 m. in 5 seconds. How much powder was expended?

Answer 1

Divide the work done (W) by the length of the time interval (t).

P = W/t = mgh/t

m = 4 kg

g = 9.8 m/s²

h = 2 m

t = 5s

Plug in these numbers and get the power in watts.