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Vo = 2 m/s
g = 10 m/s^2
Vt^2 = Vo^2 + 2 g . h
Vt^2 = 2^2 + 2 10 x 3
= 4 + 60
Vt = 64^-1
Vt = 8 m/s
Vt²=2²+2.10m/s.3m
=4+60=64
Vt=√64
=8m/s (B)