Question

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?

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

Step-by-step 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.