abron and tyler are trying to escape a deserted island on a raft. the raft has a mass of 50kg. abron has a mass of 70kg and tyler has a mass of 65kg. tyler can exert an average force of 400 N fwd and abron can average 420 N fwd on the raft using the paddles. during the paddling, the magnitude of the water resistance (friction) on the raft is 38N, calculate the acceleration of the raft.