A supertanker with a total displacement (weight) of 140(103) long tons (one long ton equals 2240 lb) is moving forward at a speed of 2 knots when the engines are reversed to produce a rearward propeller thrust of 90,000 lb. How long would it take the tanker to acquire a speed of 2 knots in the reverse direction? Can you justify neglecting the impulse of water resistance of the hull? (Recall 1 knot = 1.151 mi/hr.)
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