A girl whose weight is 30 N runs up a flight of stairs 5 m in 6 s. What is her average power
power = work/time = (30*5)J/6s = 25W
i am so sorry what is the answer
pls tell me
To find the average power, we need to use the formula:
Average Power = Work / Time
First, let's calculate the work done by the girl. Work is given by the formula:
Work = Force × Distance × cosθ
In this case, the force is the weight of the girl (30 N), the distance is the height of the flight of stairs (5 m), and θ is the angle between the force and the direction of motion (which is 0° since the stairs are vertical).
Work = 30 N × 5 m × cos 0°
= 30 N × 5 m × 1
= 150 J (Joules)
Now, we need to find the average power. Given that the time taken is 6 s:
Average Power = Work / Time
= 150 J / 6 s
= 25 W (Watts)
Therefore, the girl's average power is 25 Watts.