Answer:
The answer to the question is;
To climb three flights of stairs, a vertical height of 15.0 m will take Lars 13.04 s.
Explanation:
To solve the question, we note that
Mass m of Lars = 66.1 kg
Rate of doing work, power of Lars = 746 W = 746 J/s = Energy/time
Height of the stairs = 15.0 M
Energy required = Potential energy gained at top of stairs = m×g×h
m×g×h = 66.1 kg×9.81 m/s²×15 m = 9726.615 J
Therefore the time required = Energy/Power = 9726.615/746 = 13.04 s
It take Lars 13.04 s to climb three flights of stairs, a vertical height of 15.0 m
