Answer:
5/32 or 0.16 m/s
Step-by-step explanation:
m1u1 + m2u2 = m1v1 + m2v2
(64x0) + (0.2 x 0) = (64 x v1) + (0.2 x 50)
v = (0.2 x 50) / 64
v = 5/32 or 0.16 m/s
(ignore negative sign as it means that the boat is moving the opposite direction of ball, that's why the answer was coming negative)
I hope my answer helps you.