A few days ago I was thinking about the time duration that a force changes the velocity of the object its applied to and I reached the conclusion that the effect of force is at the moment of its applying.I mean if a shot to the ball gives it a maximum velocity V.then the ball's velocity at the moment of applying the force from your foot is V.(adsbygoogle = window.adsbygoogle || []).push({});

You all know the formula [tex] F=m \frac{\Delta v}{ \Delta t} [/tex].if we want to apply the last paragraph to this formula,we should tend [tex]\Delta t [/tex] to zero which gives us infinity and means that just very large forces show their effect at the moment of their applying which is not what we said in the last paragraph.

I wanna know which of the things I've said is correct?

thanks alot

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# A question on Forces

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