Ooh, shiny new blog... *knocks on wall and hears empty echoing-sound*
Fill it up then shall we? *sits down to homework*
The power of a motor lifting 1000kg for a height of 6m in 15 seconds... hmmm
I'll use the formula for Power, P = W/t, t = obviously 15s, W = in joules(J) which is Nm. And as N = mg, P = mgd/t (where m = mass in kg and g = gravity (9.8ms-2)
That settled... P = (1000kg x 9.8ms-2 x 6m)/15s = 3920Nms-1 = 3920W = 3.9kW (2 s.f.)
... Nice, although quite easy still...
I must say homework is a lot more fun this way, but it doesn't get done a lot faster