A rescue capsule of mass 600 kg is lifted vertically by a cable. Its upward acceleration is modelled as constant at 0.8 m s-2 while the tension is constant. Use g=9.8 m s−2g=9.8\text{ m s}^{-2}g=9.8 m s−2.
Find the tension in the cable predicted by the model.
Sensors show that the capsule's acceleration varies between 0.6 m s-2 and 1.0 m s-2. Find the corresponding range of tensions, assuming the mass is unchanged.
Give one reason for the variation in acceleration.