Chapter 11 Answer Key: Conservation of Mechanical Energy

11.1 Conservation of Mechanical Energy

1.  42 m

2.  15.4 m/s

3.  184 m

4.  7.0 m/s

5.  21 m/s

6.  17 m/s

7.  (i)  16 J      (ii)  237 J

8.  40 m/s

9.  (i)  1200 J     (ii)  22 m/s

10.  61 m/s

11.  35 m/s

12.  31 m/s

11.2 Non-Horizontally Launched Projectiles made easy using Conservation of Energy

1.  50 m/s

2.  15.6 m/s

3.  67 m/s

4.  31 m/s

11.3 Elastic and Inelastic collisions

1.  Inelastic Collision (E_ki = 0.5625 J,  E_kf = 0.3437 J)

2.  0.0135 m/s South

3. (i) 3.46 m/s  (ii) – 0.54 m/s  (iii) Inelastic Collision  (iv)  3.46 Ns

11.4 Work, Force & Change in Energy Problems – Launching and Braking Devices

1.  (i)  7.9 m/s(ii)  – 1100 J(iii)  – 11 000 N

2.  2000 N

3.  – 10 500 N

11.5.1 Trebuchet

1.  v_i = 41 m/s

11.5.2 Kingda Ka: Six Flags Great Adventure

1.  v_f = 23 m/s