between c and d the person is slowing For questions 38 to 41 refer to the follow

Question

between c and d the person is slowing For questions 38 to 41 refer to the following graph which represents the vertical ground reaction force after perfor ming a sudden movement from a stationary position. VERTICAL GROUND REACTION FORCE BW A B C D E TIME 38. At which point is the person moving with constant velocity? a, A b.? ?.? d, D e, E 39. Between C and D the person is slowing down a. true b. false 40. At which point is the person increasing speed at the greatest rate? 41. At which point is the greatest speed attained? 42. Typically, when increasing running velocity from very slow to slow speeds, the rate of change of stride rate is usually greater than the rate of change of stride length. a. true b. false

Explanation / Answer

38. At point E the person is moving with the constant velocity because the graph line is straight.

Hence option (e) is correct.

39. From point C to D the speed increases, so person is not slowing down.

Hence option (b) is correct.

40. At point C the person is increasing the speed at greatest rste as shown by sudden rise in the graph line at point C.

Hence option (c) is correct.

41. The greatest speed is attained at point D, after that speed decreases upto point E and then remains constant.

Hence option (d) is correct.

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