Hello, I was able to get the $2$nd part, but not the first part.

Two shuffleboard disks of equal mass, one orange and the other green, are involved in a perfectly elastic glancing collision. The green disk is initially at rest and is struck by

the orange disk moving initially to the right at vec$(v{)}_{Oi}=6\mathrm{.}75\frac{m}{s}$ as in Figure a$,$ shown below. After the collision, the orange disk moves in a direction that makes an angle of

$=39\mathrm{.}0$ with the horizontal axis while the green disk makes an angle of $=51\mathrm{.}0$ with this axis as in Figure b$.$ Determine the speed of each disk after the collision.

$v_{of}=$ Your response differs from the correct answer by more than $10\%.$ Double check your calculations. $\frac{m}{s}$

$v_{gf}=,\frac{m}{s}$

Before the collision