An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. when the craft was stationary, the tension in the cable was 7000 n. when the craft was lowered or raised at a steady rate, the motion through the water added an 1800 n drag force.

Given that An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. when the craft was stationary, the tension in the cable was 7000 n. when the craft was lowered or raised at a steady rate, the motion through the water added an 1800 n drag force.

The tension in the cable when the craft was being lowered to the seafloor

=Difference of the two forces = 7000-1800 =5200 N.  

The tension in the cable when the craft was being raised from the seafloor?

Sum of the two forces = 7000+1800 =8800 N.  

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