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A spaceship in space sweeps stationary interplanetary dust. As a result, its mass increases at a rate [dM (t)] / dt = bv² (t), where v(t) is its instantaneous velocity. The instantaneous acceleration of the satellite is:

1) –bv³(t)
2) –bv³ / M(t)
3) –2bv³ / M(t)
4) –bv³ / 2M(t)

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