6) This question is very straightforward. We need to find the situation in which the ball will be in air for the longest time. We can take a look at just the y-component of the velocity. We can use this kinematic equation to try to find which would have the greatest time.
We don't need to actually solve this equation. However it is crucial to recognize that the greater the y-component of the velocity, the longer the time in air.
Although situation C and D have large y-components of velocity, they are in the -y-direction, which will actually decrease time. Situation A has no y-component of its velocity so it will hit the ground after choices C and D. Situation B had the greatest y-component of velocity, and it will have the longest time in air. This is the order of when the balls will hit the ground from first to last: C, D, A, B.
Answer: B
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