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|dw:1354449116877:dw|

yes i got my answer as 0.5886 which is equal to PE after impact

wht is the energy loss?

|dw:1354449520295:dw|

What do you think?

how is KE at position3 = 0?

Velocity at the max point is 0, so KE=0 :|

Oh... Is 1.2m the max. height of the rebound?

tht wsnt given in the question?

.392J

why would the Kinetic energy at lowest point = Loss in potential energy?

Ep + Ek at 1 = Ep + Ek at 2
mgh + 0 = 0 + 1.2mv^2
mgh = Ek

mechanical energy is not really conserved since you've loss of rebound height, right?

one more question K.E at position3 = 0?

yeah. As Callisto said, that's when the velocity becomes 0, i.e. it stops.

thanks:)

you're welcome :)

correct!