Question

a person weighing 50kg runs up in a hill raising himself vertically 10m in 20sec. calculate the power of the person. given g=9.8m/s2

Answer 1

Answer:245W

Step-by-step explanation:

M= 50 kg

H = 10 m

G = 9.8m/s2

W=mgh

W=50 x 10 x 9.8

W=4900J

Now,

P=W/t

P=4900/20

P=245W

Answer 2

Given:

• mass of the person, (m) = 50 kg
• height of the hill, (h)= 10m
• Time taken to climb hill the height of 10m = 20secs
• g = 9.8 $m/s^2$ (gravitational force)

To Find:

• Power of the person.

Solution:

• To find power, we already know the power formula given by,
• Power (P) = $\frac{work done}{Time}$
• We need to find the work done by the person using a different formula as it is not given.
• To find work done we use, Work done (W) = Mass*gravitational force*height
• W = m*g*h = 50*9.8*10 = 4900 Joules.
• W = 4900 J.
• Power , P = W/T =  4900/20 = 245 watts

Power, P = 245 watts.