Answer:
θ = 39.8°
Step-by-step explanation:
Her, we will use the trigonometric ratio of the tangent to find the launch angle of the projectile from the vertical:

where,
θ = launch angle from the vertical = ?
vy = vertical component of velocity = 5 m/s
vx = horizontal component of velocity = 6 m/s
Therefore,

θ = 39.8°