Question

A ball is dropped from a height of 1.0 m onto a hard concrete floor. It bounces back to a height of 0.75 m. Find what fraction of its mechanical energy was lost in the bounce.

Answer 1

@britneyspears

Answer 2

Is the mass or velocity given?

Answer 3

just that

Answer 4

I'm going to work this out on paper for a bit. I'm not really sure what approach to take. The first that comes to mind is an energy-momentum approach, but no velocity is given, plus energy is not conserved, some is lost as the question states.

Answer 5

I'm actually thinking that it's 25%.
\[{1-0.75\over 1}={{.25\over 1}}\]

Answer 6

the options are 1,0.75,0.25, or 0

Answer 7

you couldn't have said that sooner?

Answer 8

sorry!! :(

Answer 9

next time, give all of the information sheesh

Answer 10

ok so it's 0.25?

Answer 11

supposedly

Answer 12

ok one last question and I'll be finished

Answer 13

post a new one