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12. D
13. C
14. A
15. Ep = m.g.h
=2.5.10 = 100 (D)
16. Ep = m.g.h
= 65 * 5 * 10 = 3250 (C)
17. Ek2 = 0.5. m2. 20²
100kJ = 0.5 . m2 . 400
100kJ = 200 m2
m2 = 500 kg
m1 = 2 . m2 = 2 . 500 = 1000 kg (B)
18. B
19. massa = Ek. 2 / v²
= 500 * 2 / 10²
= 1000/100 = 10kg (C)
20. D
21. A
22. D
23. C
24. A
25. A
26. B
27. C