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On the right is the timetable of train T1 / T2 running between Beijing West and Changsha Suppose that the train arrives and leaves on time and moves in a straight line (1) What is the average speed of the train from Changsha to Wuchang? (2) What is the average speed of the train from Zhengzhou to Yueyang? (3) What's the speed of train T1 at 5:05? What's the speed of the whole journey? Beijing West ↓ Changsha T1 times Distance from Beijing West (km) ↑ Changsha T2 times 17: Beijing West 23:29 23:35 / x09690 / X09 Zhengzhou / x091:45 1:39 5:01 5: 09 / x091226 / X09 Wuchang / x0920:12 20:04 7:12 7: 18:58 17:56 8: 38 / x091588 / X09 Changsha / x0916:36
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104.4km/h 98.6km/h 0；101.6km/h
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- 9. If the displacement of an object moving in a straight line with uniform velocity is s in time t, and the instantaneous velocity in the middle of the time is V1, and the instantaneous velocity in the middle of the displacement is V2, then () A. Whether it is uniform acceleration or uniform deceleration, V1 < V2b. Whether it is uniform acceleration or uniform deceleration, V1 > V2C. Whether it is uniform acceleration or uniform deceleration, V1 = v2d. When it is uniform acceleration, V1 < V2, when it is uniform deceleration, V1 > v2
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