an elevator of mass M is suspended from a vertical cable. When the elevator is accelerating downward with an acceleration magnitude of 5.8 m/s^2, the tension in the cable is 3644N, what is the mass of the elevator? I had a few ideas.. T - mg = ma T = m(g + a) T/(g+ a) = m Or i was thinking 3644N = Kg/M/s^2, you could just divide by 5.8 and the M/s^2 cancel out, leaving M which is = 628kg .. what is the moons orbital speed? Mass Earth 6 x 10^24 kg Mass Moon 7.36 x 10^22 kg Radius Earth 6400km Radius Moon 1740km Mooms orbital radius 3.84 x 10^8 for this i was thinking a = v²/r, and plug that into Newton's second law.. but i dont think thats right A 24kg mass sits on a frictionless plane. Calculate the force required to give an acceleration of 5 m/s^2 up the plane (mass = 24kg, Angle=37) and a speeding motorist passes a stopped police car. At the moment he passes the police car begins accelerating at a constant rate of 4.4 m/s². the motorist unaware that he is being chased, continues at constant speed until the police car catches him 12s later. how fast was the motorist going?