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We know that force equals a mass times its acceleration. That means, among other things, that no mass can change its velocity in zero time. Am I right so far?’ ‘Yes, keep going.’ ‘Well, when an object is first moved, from a standstill, there has to be one instant where the mass has gone from not moving to moving in essentially zero time. Wouldn’t that require an infinite force at that instant?’ ‘You won’t like my answer doc. I’m not copping out. Acceleration is the change in velocity with respect to time. In the absolute instant an object starts to move there is, what is called, a singularity. That means that the region at that point is discontinuous. Because it is discontinuous normal calculus doesn’t work. The problem you have posed is outside the range of classical physics to handle since it is outside the range of the mathematics that we use. This isn’t a cop-out. It is simply the way it is.’ ‘O.k., John. Let me ask you a second question. Since starting an object moving from rest. It was really impressive. I took a pull on my soda — it was awful, but cool and wet. Charlie finished his. Weena barely took a sip. "Feel up to going back?" she asked."Ayup." Charlie looked better. He had some color again. "If'n he wants me to take care of them critters, I'd better go look at 'em."Back at the bank, Henderson had a form to open an account — Weena was astute enough to realize that Charlie didn't have an address yet and cleverly had him put in 'care of' our address in Perth. They also had a plastic card for Charlie to use for cash. He said there'd be cheques in 24 hours (I bet there would be for $750,000!). I tossed in that we'd be by "the day after tomorrow."Then Reynolds gave Charlie his passport, but "requested" that he stop by the station within the next week. And everybody shook hands with everybody else — Charlie caught himself and just gave Weena a hug. Finally, I asked Reynolds where the stock yards were and he gave instructions. And we left.There was a cab.
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