Problem $11\mathrm{.}128-$ Relative motion of a projectile with constant accelerations$-$find a relative velocity

Conveyor belt $A,$ which forms a $20$ angle with the horizontal, moves at a constant speed of $4f\frac{t}{s}$ and is used to load an airplane. Knowing that a worker tosses duffel bag $B$ with an initial velocity of $2\mathrm{.}5f\frac{t}{s}$ at an angle of $30$ with the horizontal, determine the velocity of the bag relative to the belt as it lands on the belt.

The velocity of the bag relative to the belt as it lands on the belt is

$f\frac{t}{s}$ at an angle of

$1.$