A mass m = 1 kg is falling downward under the effect of gravity and of a vertical upward force P = 3 N. Assuming for simplicity that g≅10 m/s2. What is the acceleration of the mass?
A: 7 m/s2 upward
B: 3.5 m/s2 downward
C: 10 m/s2 downward
D: 7 m/s2 downward
E: 3 m/s2 upward
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