A ball is projected horizontally from the top of a building.One second later, an

Question

A ball is projected horizontally from the top of a building.One second later, another ball is projected horizontally from thesame point with the same velocity. At what point in the motion willthe balls be closest to each other?

Will the first ball always be traveling faster than the secondball? 2 yes
no


What will be the time difference between them when the balls hitthe ground? 3 no time difference
between one and ten seconds
one second
it depends on the height of thebuilding


Can the horizontal projection velocity of the second ball bechanged so that the balls arrive at the ground at the sametime? 4 yes
no

Explain the last answer.
2 yes
no
2 yes
no
2 3 no time difference
between one and ten seconds
one second
it depends on the height of thebuilding
3 no time difference
between one and ten seconds
one second
it depends on the height of thebuilding
3 4 yes
no
4 yes
no
4

Explanation / Answer

the balls will be closest to each other at the moment the secondone is launched (excluding when they both hit the ground). both balls have increasing velocities, so the initial situation hasthe lowest initial velocities. the answer to the first question is yes. both balls have thesame acceleration due to gravity, and since the velocity of thefirst ball is initially greater than the velocity of the secondball, the first ball will always be faster. since the second ball was launched one second later with the sameinitial conditions, then it would hit the ground one second lateras well. the answer to the last one is no. horizontal velocity has noeffect on the downward velocity, which is controlled bygravity. If you drop a ball, it would take the same amount oftime to hit the ground as if you were to launch it horizontally atany speed.

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