Answer:
31.3 m/s
Explanation:
v² = v₀² + 2aΔx
v² = 0 + 2(9.8 m/s²)(50 m)
v² = 980 m²/s²
v = √ 980 m²/s² = 31.3 m/s
Notes: ball starts from rest, so v₀ = 0; ball is in free fall, so a = g = 9.8 m/s²; objects in free fall accelerate at the same rate, g, independent of mass.