Answer:
600 m/s
Step-by-step explanation:
Energy is conserved from (b) to (c).
½ (M + m) V² = (M + m) g h
V² = 2gh
V² = 2 (9.8 m/s²) (0.45 m)
V = 2.97 m/s
Momentum is conserved from (a) to (b).
mv = (M + m) V
(0.015 kg) v = (3.0 kg + 0.015 kg) (2.97 m/s)
v = 597 m/s
Rounding, the ball is fired at 600 m/s.