Three boys each of mass 25kg stand on a plank of Mass 25kg placed at rest on a smooth horizontal surface. If all the three boys jump of the plank simultaneously in same horizontal direction of the plank at 2m/s with respect to plank. Then speed gained by the plank 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 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 block of mass 5 kg is placed on a plank of mass 10 kg which is placed on the smooth horizontal surface as shown in figure. If a 100 N force is applied on the plank then the acceleration of the plank wrt ground is (Coefficient of friction between block and plank mu_s= mu_k=0.4 and g = 10 m/s^2 )

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 :-

A man of mass m moves on a plank of mass M with a constant veloicty u with respect to the plank, as shown in figure. a.If the plank rest on smooth horizontal surface, determine the velocity of the plank. b If the man travels a distasnce L with respect to the plank, find the distance travelled by the plank with respect to te ground.

A sphere of mass m and radius r is placed on a rough plank of mass M . The system is placed on a smooth horizontal surface. A constant force F is applied on the plank such that the sphere rolls purely on the plank. Find the acceleration of the sphere.

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 is standing on a plank which is placed on smooth horizontal surface. There is sufficient friction between feet of man and plank. Now man starts running over plank, correct statement is/are

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.

A man of mass m is standing at one end of of a plank of mass M. The length of the plank is L and it rests on a frictionless horizontal ground. The man walks to the other end of the plank. Find displacement of the plank and man relative to the ground.