An elevator containing heavy mining equipment has a total mass of 5500 kg. The elevator accelerates vertically downwards into a mine shaft at 1.2 m s-2. Taking the acceleration due to gravity g g\,g as 9.81 m s-2, what is the upward tension force in the supporting cable?
6.6×103 N6.6 \times 10^{3}\text{ N}6.6×103 N
4.7×104 N4.7 \times 10^{4}\text{ N}4.7×104 N
5.4×104 N5.4 \times 10^{4}\text{ N}5.4×104 N
6.1×104 N6.1 \times 10^{4}\text{ N}6.1×104 N
