Question

A dog weighing 5kg is standing on a flat boat so that it is 10 metres from the shore. It walks 4m on the boat towards the shore and then halts. The boat weighs 20kg and one can assume that there is no friction between it and water. The dog from the shore at the end of this time is

Easy

Solution

Distance from shore = (10 - l + d ) here l=4m and $d = \frac{5 \times 4}{25} = 0.8 m$

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