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Option 3 100m/s upwards.
Using conservation of momentum.
And Newton's equation of motion.
V=u+at
V=100-5(10)
V=50 m/s
MV=m1v1+m2v2
1×50=400/1000(-25)+600/1000(v)
Solving the equation.
V=100 m/s upwards.
-25 because it's going down and 600 grams is the remaining mass.
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