5. A bullet with a mass of 28 g is fired from a 2.8-kg gun that is stationary, but free to recoil. After the bullet is fired, the gun is observed to be moving at 1.4 m/s [left]. The velocity of the bullet is a. 140 m/s [left] d. 71 m/s [left] b. 140 m/s [right] e. 71 m/s c. 71 m/s [right] 6. An arrow slows down from 43 m/s to 28 m/s as it passes through an apple. If the 493-g apple was originally at rest and sped up to 0.44 m/s, the mass of the arrow is a. 5.0 g d. 29 g b. 7.7 g e. 7.7 kg c. 14 g 7. A goalie standing on a frictionless surface catches a 270.0-g puck travelling at 95.0 km/h. After catching the puck, the goalie is moving at 8.90 cm/s. The mass of the goalie (including equipment) is a. 75:2 kg d. 84.2 kg b. 79.8 kg e. 91.7 kg c. 80.1 kg