5. a 55-kg swimmer is standing on a stationary 210-kg floating raft. the swimmer then runs off the raft horizontally with the velocity of +4.6 m/s relative to the shore. find the recoil velocity that the raft would have if there were no friction and resistance due to the water.

The recoil velocity of the raft is 1.205 m/s.

Explanation:

given that,

Mass of the swimmer,

Mass of the raft,

Velocity of the swimmer, v = +4.6 m/s

It is mentioned that the swimmer then runs off the raft, the total linear momentum of the  swimmer/raft system is conserved. Let V is the recoil velocity of the raft.

V = -1.205 m/s

So, the recoil velocity of the raft is 1.205 m/s. Hence, this is the required solution.

a and c

c is 100% but i am confused in a