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## Homework Statement

A 40.8 g ball of clay hits and sticks to a 3.41 kg block sitting at rest on a frictionless surface. What is the speed of the block after the collision if the initial speed of the ball of clay is 5.04 m/s?

b)What percentage of the system's initial energy is lost?

## Homework Equations

pinitial=pfinal, E=0.5mv

^{2}

## The Attempt at a Solution

for the first part i figured out the speed final which is 0.0596 m/s

for the second part for each i figured the initial energy and then the final energy using the energy equation for both objects involved. after this part i am stuck to figure out the energy lost i came up with this equation 100-(E

_{initial}-E

_{final}/E

_{final}) x100.. i used it and am not getting the right answer..pls. help