$($a$)$ Number

Units

$1$

$($b$)$ Number

Units

eTextbook and Media

Hint

Assistance Used

Did you use one of the two equations for a one$-$dimensional elastic collision? The com velocity is the time derivative of the com

position function, as shown in Mvec$($v$)\_($com $)=$m$\_(1)$vec$($v$)\_(1)+$m$\_(2)$vec$($v$)\_(2)+$m$\_(3)$vec$($v$)\_(3)+$dots$+$m$\_($n$)$vec$($v$)\_($n$).$

Attempts: $2$ of $3$ used After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at $\backslash (1/5\backslash )$ their initial speed. Find the angle between the initial velocities of the objects.

Number

Units

eTextbook and Media

Hint

Assistance Used

Did you place an $\backslash ($ x $\backslash )$ axis along the final path so that the incoming paths are symmetric about the axis? $($That decreases the amount of algebra.$)$ Did you assign symbols for the mass, the initial speed, and angle? Did you find the $\backslash ($ x $\backslash )$ components of the initial and final momenta? Did you set the sum of the $\backslash ($ x $\backslash )$ components before equal to the $\backslash ($ x $\backslash )$ component after?

Attempts: $2$ of $3$ used