Question

Three men A, B & C of mass 40kg, 50kg & 60kg are standing on a plank of mass 90kg, which is kept on a smooth horizontal plane. B sits in the middle of the plane and A and C sit 2 metres away on opposite sides. If A & C exchange their positions then mass B will shift (1) 1/3m towards left (2) 1/3m towards right (3) will not move w.r.t. ground (4) 5/3 m towards left

Answer 1

try it by yourself. ...first. ..