You and your friend are stranded on a raft of mass 1000 kg which is not moving, you can neglect friction between the boat and the water. After a strong argument, your friend throws the paddle of mass 40 kg overboard at a speed of 3 m/s. What is the recoil speed of the raft?

Question

Physics

Kolten Waters

10 August, 09:41

You and your friend are stranded on a raft of mass 1000 kg which is not moving, you can neglect friction between the boat and the water. After a strong argument, your friend throws the paddle of mass 40 kg overboard at a speed of 3 m/s. What is the recoil speed of the raft?

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Answers (1)

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Aaliyah Acosta · Answer 1

Mass of raft=m1 = 1000kg

Mass of paddle=m2=40kg

Speed of paddle=v2=3 m/s

Speed of raft=recoil speed=v1=?

Formula

V1 = - (m2/m1) v2 = - (40/1000) 3 = - 0.12m/s

Explanation:

Here the raft has much greater mass as compare the paddle and its velocity will always be negative due to recoil. 1 and 2 with masses and velocities are subscripts.