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竖直向上抛出一小球,3s末落回到抛出点,则小球在第2秒内的位移(不计空气阻力)是( )
A.0
B.5m
C.10m
D.-1.25m
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竖直向上抛出一小球,3s末落回到抛出点,则小球在第2秒内的位移(不计空气阻力)是( )
A.0
B.5m
C.10m
D.-1.25m
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竖直向上抛出一小球,3s末落回到抛出点,则小球在第2秒内的位移(不计空气阻力)是( )
A.0
B.5m
C.10m
D.-1.25m
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竖直向上抛出一小球,3s末落回到抛出点,则小球在第2秒内的位移(不计空气阻力)是 ( )
A.0 B.5m C.10m D.-1.25m
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竖直向上抛出一小球,3s末落回到抛出点,则小球在第2s内的位移(不计空气阻力)是( )
A.0 B.5 m C.10 m D.1.25 m
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竖直向上抛出一小球,3 s末落回到抛出点,则小球在第2 s内的位移(不计空气阻力)是( )
A.0 B.5 m C.10 m D.1.25 m
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竖直向上抛出一小球,3s末落回到抛出点,g取10m/s2,不计空气阻力.则( )
A.小球在第2秒内的位移是l0m
B.小球在第2秒内的位移是0
C.小球上升的最大高度是11.25m
D.小球上升的最大高度是1.25m
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将一小球以10m/s竖直向上抛出,不计空气阻力,小球的速度随时间变化的图象如图所示,则下列说法正确的是( )
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)
A.1s末小球到达最高点
B.1s末加速度方向发生改变
C.2s小球回到抛出点
D.2s内位移为10m
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从地面上以一定初速度竖直向上抛出一小球,经过一段时间后,小球落回到地面.在不计空气阻力和计空气阻力两种情况下做一对比,下列说法正确的是( )
A.在上升过程中,小球的加速度不计空气阻力时的大于计空气阻力时的
B.在下降过程中,小球运动的时间不计空气阻力时的小于计空气阻力时的
C.从抛出到落回地面整个运动过程的位移,不计空气阻力时的等于计空气阻力时的
D.返回到原拋出点的速率,不计空气阻力时的小于计空气阻力时的
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在竖直的井底,将一物块以11m/s的初速度竖直向上抛出,物体冲出井口再落回到井口时被人接住,在被人接住前1s内物体的位移是4m,位移方向向上,不计空气阻力,取g=10m/s2.求:
(1)物体从抛出点到被人接住所经历的时间;
(2)竖直井的深度.