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CBSE Class 11-science Answered

A boy of mass 25kg is standing on a stationary boat of mass 75kg. If the boy walks along the length of the boat at a speed of 1ms-1 with respect to the boat, find the velocity of the boat with respect to water. (Neglect friction from water on the boat)

Asked by varakalasuchi3 | 29 Oct, 2018, 06:06: PM
Expert Answer
Centre of Mass does not move, because no external force is acting. Hence velocity of centre of mass is zero.
 
let v be the velocity of boat
 
25×1 + 75×v = 0  or v = -1/3 m/s
 
boat will move with speed 1/3 m/s in opposite direction of boy's movement
Answered by Thiyagarajan K | 29 Oct, 2018, 08:08: PM
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