A rocket with a lift-off mass 3.5 x 104 kg is blast upward with an initial acceleration of 10m/s2. Then, the initial thrust of the blast is
(a) 1.75 × 105 N
(c) 7.0× 105 N
(b) 3.5 × 105 N
(d) 14.0 × 105 N
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