part 1 of 3 Your response... A 51.6 kg man stands in a 120 kg rowboat at rest in still water. He faces the back of the boat and throws a 7.9 kg rock horizontally at a speed of 29 m/s. The boat recoils forward and comes to rest 3.4 m from its original position. The acceleration of gravity is 9.8 m/s2. Calculate the initial recoil speed of the boat. Answer in units of m/s. Answer in units of m/s part 2 of 3 Your response... What is the loss in mechanical energy due to the frictional force exerted by the water? Answer in units of J. Answer in units of J part 3 of 3 Your response... What is the effective coefficient of friction i between the boat and water