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P
Balloon:
y=(1/2)a.30^2; vy=30a;
Ball:
y=10vy - (1/2)g.10^2;
Thus: -(1/2)a.30^2=10vy-(1/2)g.100 = 10.30a - (1/2)g100
a = 0.654 m/s^2
etc.