Question

How much time is it required for a athlete to lift a 1200 Kg weights up 14m from the ground if he can only produce 9 Kw of power.

Answer 1

Given,

The mass is m=1200kg

Height is h=14 m

Power is P=9kW

We know

Energy per unit time is power.

Thus,

P=mgh/t

where t is the time.

Thus,

`\begin{gathered} 9*10^3=(1200*9.81*14)/(t) \\ \Rightarrow t=18.312 \end{gathered}`

The time is 18.312 sec.