At a major league baseball game, a pitcher delivers a 45 m/s (100. 7 mph) fastball to the first player at bat, who bunts (meets the pitch with a loosely held stationary bat) so that the ball leaves the bat at only 5 m/s (11. 2 mph) directly back towards the pitcher. The second player at bat also receives a 45 m/s fastball from the pitcher, but he swings his bat hard and sends the ball in a fast line drive directly back towards the pitcher at 50 m/s (111. 8 mph). The mass of a standard baseball is 0. 145 kg.