Calculating Work Load: 55kg Mass Walking up 20 Steps

[SailorMoon01]

A person with mass 55kg walks at a constant speed up a set of stairs with 20 steps, each 20 cm high.


I have to find the work load.
Formula: W=FxD where F is force and D is displacement.

The book says my answer should be 2.2x10^3. OR 2,200 Joules.

I really don't know how to do this. Please help me :)

 

[PeterO]

A person with mass 55kg walks at a constant speed up a set of stairs with 20 steps, each 20 cm high.


I have to find the work load.
Formula: W=FxD where F is force and D is displacement.

The book says my answer should be 2.2x10^3. OR 2,200 Joules.

I really don't know how to do this. Please help me :)

20 steps each 20cm high totals 4m.
How much work is done raising a 55 kg mass through 4 m. That could be a good start.
I wonder whether you are supposed to take the value of g as 9.81, just 9.8 or perhaps even a round 10.

 

[tal444]

9.8 is probably fine, considering the answer and all the values given only have two sig figs.

 

[PeterO]

9.8 is probably fine, considering the answer and all the values given only have two sig figs.

If you want to get 2.2 x 10³N that would be fine, but if you want to get 2200 it is not. My statement was a hint rather than a puzzle to me.