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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 1 > Chapter 10 - COM, Momentum and Collision > A wooden plank of mass M and length L is floating in still water. A persons of mass m starts at one end of the plank and reaches to other end other end in time t0, moving with a constant speed. Choose the correct option. (i) The speed of the person as seen from the ground is smaller than L/t0. (ii) The speed of the plank as seen from the ground is (m/m+M)L/t0. (iii) The speed of the plank as seen from the ground is (M/m+M)L/t0. (iv) The total K.E. of the system is 1/2(m+M)(Lt/0)^2.

A wooden plank of mass M and length L is floating in still water. A persons of mass m starts at one end of the plank and reaches to other end other end in time t0, moving with a constant speed. Choose the correct option. (i) The speed of the person as seen from the ground is smaller than L/t0. (ii) The speed of the plank as seen from the ground is (m/m+M)L/t0. (iii) The speed of the plank as seen from the ground is (M/m+M)L/t0. (iv) The total K.E. of the system is 1/2(m+M)(Lt/0)^2.

A rod of length is 3m and its mass per unit length is directly proportional to distance x from one end the centre of gravity of the rod from that end will be at A wooden plank of mass M and length L is floating in still water. A persons of mass m starts at one end of the plank and reaches to other end other end in time t0