Calculation: 475b9o - 1

v_y  = 
 v0* sin(α)- g* t
v_y =  v0* sin(α)- g* t$$v_{y}$$ = $$v0\cdot sin(\alpha)-g\cdot t$$
v_y =  sin(α)* v0- g* t$$v_{y}$$ = $$sin(\alpha)\cdot v0-g\cdot t$$