16.An astronaut of weight M g is in a rocket accelerating upward with an acceleration of 4 g. The apparent weight of the astronaut will be

17.Husband and wife stand facing each other and pull on a light rope stretched between them. How far each has moved when they meet ?Given : Husband s weight = 60 kg wt.Wife s weight = 40 kg. wt.Initial separation = 5 m.

18.Two masses 3 kg and 5 kg are suspended from the ends of an unstretchable massless cord passing over a frictionless pulley. When the masses are released, the pressure on the pulley is

19.A block of mass M placed on a horizontal surface is connected to a nylon rope of mass M. A. force f 1 N is applied to the free end of the rope in the horizontal direction. The tension at the mid-point of the rope is

20.A block of weight W is suspended from the mid-point of a rope whose ends are at the same horizontal level. The force required to straighten the rope is