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Gaokao Physics Practice Question

一同学将排球自O点垫起,排球竖直向上运动,随后下落回到O点。设排球在运动过程中所受空气阻力大小和速度大小成正比。则该排球( )

  1. A.上升时间等于下落时间
  2. B.被垫起后瞬间的速度最大
  3. C.达到最高点时加速度为零
  4. D.下落过程中做匀加速运动

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