1. mass of dry raisins = 5.4 g
mass of raisins after soaking = 7.6g
mass of water imbibed = 7.6 - 5.4 = 2.2g
percentage of water imbibed = (2.2/5.4)*100 =40.74%
2. When the player lowers his hand, it increases the time of catching. And hence the force acting on the hand reduces. So to reduce the force, he lowers his hand.