Question

A woman of mass 50 kg runs up a 300m high hill in 5 min. Her power is:

a) 150 W
b) 500 W
c) 100 W
d) 50 W
e) 300 J

Answer 1

Her power is 50 W

Step-by-step explanation:

This is because formula for power is (mass*length[in meters])/time[in seconds]

on applying it we get

50kg*300m/300sec = 50 W

Answer 2

Answer: We can use the formula for power:

Power = Work / Time

To find the work done by the woman, we can use the formula:

Work = Force x Distance

where Force = mass x acceleration, and acceleration = gravity = 9.8 m/s^2

Force = mass x acceleration = 50 kg x 9.8 m/s^2 = 490 N

Distance = 300 m

So, Work = Force x Distance = 490 N x 300 m = 147,000 J

Converting the time of 5 min to seconds, we get:

Time = 5 min x 60 s/min = 300 s

Now, we can calculate the power:

Power = Work / Time = 147,000 J / 300 s = 490 W

Therefore, the woman's power is 490 W (option b).

Step-by-step explanation: