a 40 kg child slides down a frictionless playground slide from a height of 2.0m.

What is her speed at the bottom of the slide?

Would the answer to part A change if she jumped straight down instead of sliding?

How would the answer to part A change if the slide were not frictionless?

Where does the lost energy go?

1 answer

look at energy:
KE at bottom=PEat top + KE initial0- fricton
if she started at zero velocity
1/2 m v^2=mg*2 + O - 0
solve for v at the bottom.

Now if she jumpted straight down, she would have KE initial, and v would be differnt.
If it had friction that woujld be in the equation above.

Lost energy: heat mainly