Question

How much power is required to lift a 25 kg box to the top of a 4 meter flight of stairs in 3.5 seconds?

Answer 1

280 W

Step-by-step explanation:

ΔPE = change in potential energy (J)

m = mass (kg) = 25

g = gravity (m/s²) = 9.81

Δh = change in height (m) = 4

t = time taken (s) = 3.5

Relevant formulae:

`ΔPE = mg(Δh) \\P= (ΔPE)/(t)`

ΔPE = 25(9.81)(4)

ΔPE = 981

P = 981/(3.5)

P = 280.285...