Power mechanics physics problem

Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
3 replies · 2K views
-Aladdin-
Messages
45
Reaction score
0
A 50kg student climbs a 5.0m long rope and stops at the top.What must her average speed be in order to match the power output of 200w.
a)0.20m/s
b)0.41m/s
c)0.10m/s

My Work :
And stops at the top => v=0 and h=5m so I'll use mgh.
Now power output = variation of energy/1

But average means the variation of x /variation in time.

Any help will be great,
Thanks
 
Physics news on Phys.org


How much work does she have to do to climb the rope? In what time must she complete the climb to have her average power equal 200 W?
 


Doc Al said:
How much work does she have to do to climb the rope? In what time must she complete the climb to have her average power equal 200 W?

Work = mgh , where h=5

Power = Work/time

time = Work / power

Average speed = 5 / time(gotten) ?