In the figure shown the initial velocity of boat ( 30 kg $) +$ person ( 15 kg ) is $2 m / s$ . Find velocity of person w.r.t. boat so that velocity of boat will be $1 m / s$ in right. (Neglect friction between boat and water)

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Initial momentum: ( 30 + 15 ) × 2 = 90 Final momentum: 30 ( 1 ) + 15 v p ​ 90 = 30 + 15 v p ​ ⇒ v p ​ = 4 m / s v p b ​ = 4 − 1 = 3 m / s ( r i g h t )

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