关於物理的问题~~关於物理的问题，希望有点过程让我知道怎麼做An elevator cab that weighs 26

关於物理的问题，希望有点过程让我知道怎麼做

An elevator cab that weighs 26.3 kN moves upward. What is the tension in the cable if the cab's speed is (a) increasing at a rate of 1.10 m/s2 and (b) decreasing at a rate of 1.10 m/s2?

An 87 kg man lowers himself to the ground from a height of 7.8 m by holding onto a rope that runs over a frictionless pulley to a 70 kg sandbag. With what speed does the man hit the ground if he started from rest?

A 36 kg girl and a 6.0 kg sled are on the frictionless ice of a frozen lake, 15 m apart but connected by a rope of negligible mass. The girl exerts a horizontal 4.8 N force on the rope. What are the acceleration magnitudes of (a) the sled and (b) the girl? (c) How far from the girl's initial position do they meet?