Section 7.2 NEXT (to section 7.3)NEXT (Practice Test Answers)

Suggested Problems: 9-11 and on p172 39, 40, 42, 43, 45, 47, 48

   b. 2.0x10¹

    c. v_x = 5.0m/s; v_y = 39 m/s

10. a. (a) no change, 4.0s

          (b) twice the previous distance, 4.0x10¹ m

          (c) v_x doubles, 1.0x101m/s, no change in v_y, 39 m/s

      b. (a) increases by (square root) 2, because t= (square root) -2y/g and y doubles, 5.7 s

          (b) increases by (square root) 2, because t increases by (square root) 2, 28 m.

          (c) no change in v_x, 5.0 m/s v_y increases by (square root) 2 because t increases by (square root) 2, 55 m/s

11. 0.800 m/s

39. 29m

40. a. 0.500 s

      b. 0.800 m/s

42. a. 31 m

      b.  2.1x10² m

43. 31 m/s at 45°

45. a. 14.3 s

      b. 496 m

47. 3.2 m

48.11.8 m/s

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