A man of mass `80 kg` stands on a plank of mass `40 kg`. The plank is lying on a smooth horizontal floor. Initianlly both are at rest. The man starts walking on the plank towards north and stops after moving a distance of `6 m` on the plank. Then

A man of mass 50 kg us standing on a 100 kg plank kept on a fricitonless horizontal floor. Initially both are at rest. If the man starts walking on the plank with speed 6m//s towards right relative to the plank, then amount of muscle energy spent by the man is

A man of mass m is standing on a plank of equal mass m resting on a smooth horizontal surface. The man starts moving on the plank with speed u relative to the plank. The speed of the man relative to the ground is

A car C of mass m_(1) , rests on a plank of mass m_(2) . The plank rests on a smooth floor. The string and pulley are ideal. The car starts and moves towards the pulley with certain acceleration :

A car of mass m_(1) rests on a plank P of mass m_(2) . The plank rests on a smooth floor. The string and pulley are ideal. The car starts and moves towards the pulley with acceleration.

A man of mass m is moving with a constant acceleration a w.r.t. plank. The plank lies on a smooth horizontal floor. If mass of plank is also m then the frictional force exerted by plank on man is ma/k. Find the value of k.

A wooden plank of mass 20 kg is resting on a smooth horizontal floor. A man of mass 60 kg starts moving from one end of the plank to the other end. The length of the plank is 10 m. Find the displacement of the plank over the floor when the man reaches the other end of the plank.

A wooden plank of mass 20kg is resting on a smooth horizontal floor. A man of mass 60kg starts moving from one end of the plank to the other end. The length of the plank is 10m . Find the displacement of the plank over the floor when the man reaches the other end of the plank.

A uniform wooden plank of mass 150 kg and length 8 m is floating on still water with a man of 50 kg at one end of it . The man walks to the other end of the plank and stops. Than the distance covered by the plank is

A man of mass 50 kg is pulling on a plank of mass 100 kg kept on a smooth floor as shown with force of 100 N. If both man & plank move together, find force of friction acting on man.

Three man A, B & C of mass 40 kg, 50 kg & 60 kg are standing on a plank of mass 90 kg , which is kept on a smooth horizontal plane. If A & C exchange their position then mass B will shift :-