Page 54 - Schaum's Outline of Theory and Problems of Applied Physics

CHAP. 3] MOTION IN A STRAIGHT LINE 39

3.14. A car whose velocity is 20 km/h is given an acceleration of 5 (km/h)/s. What is its velocity after it has gone 0.25 km?
2
3.15. A sports car has an acceleration of 3 m/s . How much distance does it cover while its velocity is increased from 0 to
10 m/s? From 10 to 30 m/s?

3.16. Find the acceleration of a car that comes to a stop from a velocity of 60 m/s in a distance of 360 m.
2
3.17. A bus starts from rest and accelerates at 1.5 m/s until it reaches a velocity of 9 m/s. The bus continues at this velocity
2
and then decelerates at −2 m/s until it comes to a stop 400 m from its starting point. How much time did the bus
take to cover the 400 m?

Answers to Multiple-Choice Questions

3.1. (b) 3.6. (c)

3.2. (d ) 3.7. (d )
3.3. (c) 3.8. (c)

3.4. (b) 3.9. (d )

3.5. (c)

Answers to Supplementary Problems

3.1. (a) 720 km (b) 17.7 h 3.10. 2.5 s

3.2. (a) 145 km (b) 58 km/h 3.11. (a) 1.25 m (b) 5 m/s
3.3. 6.9 km/h 3.12. (a)6 s (b) 105 m

3.4. 100 km 3.13. 13.7 m

3.5. 3 mi/h 3.14. 27 m/s = 97 km/h
3.6. 1.75 s 3.15. 17 m; 133 m

3.7. 200 km 3.16. −5 m/s 2

3.8. 300 m/s 2 3.17. 50 s

3.9. (a) 5 m/s 2 (b)8 s