Question

Tom has a mass of 50,000 g and runs up a flight of stairs 4 m high in 12.5 seconds.

Calculate Tom’s power. (g = 10 m/s2)

Answer 1

160 watts.

Step-by-step explanation:

Remark

Power = Work / Time

Work = F * d

Note: Since he is running up stairs he is doing work against gravity.

Givens

• m = 50000 g kg / 1000 grms
• m = 50000 / 1000 = 50 kg
• h = 4 m
• time = 12.5 seconds
• g = 10 m/s^2

Formula

• P = W * d/t
• W = m*g *d / t

Solution

• P = 50kg * 10 m/s^2 * 4 m / 12.5
• P = 160 watts.