A, if this is not correct, please choose D.
Takes about an hour and a half maybe
Power is joules per second or J/s when work is measured in joules and time in seconds. The basic unit of power, 1 J/s is called a watt (W), named after James Watt who made important improvements to the steam engine. By definition, a watt is the consumption of one joule of energy per second.
Answer:
The answer is B on khan academy
Explanation:
How many stairs?
You can use this to find the work
U
W=mgh
And the power by
P=W/T