A wooden plank of length ‘L’ rests an a frictionless floor. A boy

1.	A wooden plank of length ‘L’ rests an a frictionless floor. A boy of mass ‘M’ now runs over the plank starting from its one end. If mass of wooden plank is M/5, the distance covered by the boy relative to the ground will be (1) L/6 (2) 5L/6 (3) L/5 (4) 4L/5
Answer» Correct option is (1) L/6 Let the distance travelled by boy = x. Mx = M/5 (L - x) ⇒ 5x = L - x ; ⇒ x = L/6

A wooden plank of length ‘L’ rests an a frictionless floor. A boy of mass ‘M’ now runs over the plank starting from its one end. If mass of wooden plank is M/5, the distance covered by the boy relative to the ground will be (1) L/6 (2) 5L/6 (3) L/5 (4) 4L/5

Answer»

Correct option is (1) L/6

Let the distance travelled by boy = x.

Mx = M/5 (L - x)

⇒ 5x = L - x ; ⇒ x = L/6

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A wooden plank of length ‘L’ rests an a frictionless floor. A boy of mass ‘M’ now runs over the plank starting from its one end. If mass of wooden plank is M/5, the distance covered by the boy relative to the ground will be (1) L/6 (2) 5L/6 (3) L/5 (4) 4L/5

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