5.7. A force of 1.0 lb acts on a 1.0-slug object that can move freely. The object's acceleration is 6. 1 (a) 0.031 ft/s² (c) 1.0 ft/s² (d) 32 ft/s² (b) 0.5 ft/s 5.8. A force of 1.0 lb acts on a 1.0-lb object that can move freely. The object's acceleration is (a) 0.031 ft/s² (c) 1.0 ft/s² (b) 0.5 ft/s² (d) 32 ft/s² 5.9. Four hundred grams of salami weighs (a) 0.041 N (c) 400 N (b) 3.9 N (d) 3.9 kN 5.10. A force that gives a 2.0-kg object an acceleration of 1.6 m/s² would give an 8.0-kg object an acceleration of (a) 0.2 m/s2 (c) 1.6 m/s² 63 (b) 0.4 m/s² (d) 6.4 m/s² lifted by an upward force of 200 N. The crate's upward acceleration is (c) 10 m/s² 5.11. A 20-kg crate is (a) 0.20 m/s² (b) 9 m/s² (d) 98 m/s² 5.12. A vehicle slows down from 50 to 15 fus in 10 s when its brakes exert a force of 200 lb on it. The vehicle weighs approximately (a) 57 lb (b) 560 lb (c) 1830 lb (d) 22,400 lb 5.13. A bicycle and its rider together have a mass of 80 kg. If the bicycle's velocity is 6 m/s, the force needed to bring it to a stop in 4 sis (a) 12 N (c) 120 N (b) 53 N (d) 1176 N 5.14. A 5.0-kg object, initially at rest, is acted on by a net force of 3.0 N for 3.0 s. During that time the object moves (a) 0.3m (b) (c) 1.8 m 0.9 m (d) 2.7m 5.15. A 300-g ball at rest is struck with a bat with a force of 150 N. If the bat was in contact with the ball for 0.020 s, the ball's velocity is (a) 0.01 m/s (b) 0.1 m/s (c) 2.5 m/s (d) 10 m/s