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## Homework Statement

A ball was thrown into a box. Determine Ek, P, and throwing speed when the:

mass of softball = 172.7g

mass of packed box = 2,043.5g

and the box moved from 0 cm to 2cm.

and the spring scale that remained parallel to the floor was Ff=8N.

## Homework Equations

Ff=[itex]\mu[/itex]Fn

Velocity: V=d/t

Momentum: P=mv

Work: W=F(cosθ)d

Kinetic Energy: Ek=1/2mv

^{2}

Collision: m

_{1}v

_{1}+ m

_{2}V

_{2}= (m

_{1}+ m

_{2})v'

## The Attempt at a Solution

I started with Work.

W=Fd

=8(0.02)

=0.16J

Then tried solving for V

1/2m

_{1}v

^{2}=1/2m

_{2}v

^{2}

0.5(172.7)v

_{12}=0.5(2043)v

_{22}

86.35v

_{1}

^{2}=1021.5v

_{22}

V

_{1}= 11.83V

_{2}

then plug it in to m

_{1}v

_{1}+ m

_{2}V

_{2}= (m

_{1}+ m

_{2})v' ?

Thank you :)