7) At which lettered point in the position-vs-time graph is the object\'s speed

Question

7) At which lettered point in the position-vs-time graph is the object's speed the fastest? 8) Velocity-vs-time graphs for three drag racers are shown here. Att- 5.0 s, which car has traveled the shortest distance? V (m/s) 40- V (m/s) 40 (m/s) 40 t (s) 0 Andy 5.0 0 Betty 5.0 0 Carl 5.0 A) Andy. B) Betty C) Carl. D) All have traveled the same distance. Suppose a plane accelerates uniformly from rest for 30 s, achieving a takeoff speed of 80 m's after traveling a distance of 1200 m down the runway. A smaller plane with the same acceleration has a takeoff speed of 40 m/s. Staring from rest, after what distance will this smaller plane reach its takeotf speed? A) 300 m B) 600 m C) 900 m D) 1200 m 9) to 1 3 4 5 6 78 9 10) The motion diagram of an object is shown here from o t-o s to t = 23 which graph best represents the object's velocity? 23 22 21 20 19 18 17 16 A. V D. v

Explanation / Answer

7.

The fastest speed would be at D, because the slope is largest at that point. At point B the slope will be zero.

Hence at point D , velocity is maximum

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