Please help me question 7 as soon as possible. thank you

5. A section a hill 22 m high from rest. What is (b) At the bottom? 6. A merry-go-round with a radius of 1.7 m and a moment of inertia 710 kg.m is rotating slowly at 2.4 rev/min. A boy of mass 44 kg runs tangent to the rim at a speed of 3.1 m/s and jumps on. What is the angular velocity after the boy jumps on? 7. A uniform 91-kg scaffold of length 4.6 m is supported by two light cables. A 60.0-kg window washer stands 0.5 m from the left end of the scaffold, and his window washing equipment is 1.8 m from the right end. If the tension in the left cable is three-halves (that is, 1.5 times) that in the right cable, find the tensions in the cables and the mass of the equipment. A Mars-orbiting satellite has speed 3.4 km/s when it is located 7900 km from the center of when it is at 180 km altitude? The mass of Mars is 6.39 x 1023 kg and its