Answer:
52.2 m/s at 16.7° north of east
Step-by-step explanation:
The magnitude is found with Pythagorean theorem:
v² = x² + y²
v² = (50 m/s)² + (15.0 m/s)²
v = 52.2 m/s
The direction is found with trigonometry:
tan θ = y / x
tan θ = 15.0 / 50
θ = 16.7°
The resultant velocity vector is 52.2 m/s at 16.7° north of east.