A bathyscaphe of mass m m\,m is lowered into the ocean by a vertical cable. The bathyscaphe descends with a downward acceleration aaa. A fluid drag force D D\,D acts on the bathyscaphe.
What is the tension T T\,T in the cable?
T=m(g+a)+DT = m(g + a) + DT=m(g+a)+D
T=m(g−a)+DT = m(g - a) + DT=m(g−a)+D
T=m(g−a)−DT = m(g - a) - DT=m(g−a)−D
T=m(g+a)−DT = m(g + a) - DT=m(g+a)−D
