打字猴:1.700990526e+09
1700990526
1700990527 因du/dt=a,即得
1700990528
1700990529
1700990530
1700990531
1700990532 (2)由②式,可解得
1700990533
1700990534
1700990535
1700990536
1700990537 即有
1700990538
1700990539
1700990540
1700990541
1700990542 由⑧式,可见,
1700990543
1700990544
1700990545
1700990546
1700990547 即质点在力作用下加速,其极限速度为真空光速c.
1700990548
1700990549 将⑧式两边对t求导,可得
1700990550
1700990551
1700990552
1700990553
1700990554 此式表明
1700990555
1700990556
1700990557
1700990558
1700990559 这是因为加速过程中,质点质量越来越大,可趋向无穷,加速度便趋于零.
1700990560
1700990561 联立④⑦式,得
1700990562
1700990563
1700990564
1700990565
1700990566 即有
1700990567
1700990568
1700990569
1700990570
1700990571 解得
1700990572
1700990573
1700990574
1700990575
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