Physics
SMA

่ซ‹ๅ•้€™้กŒ๐Ÿ™๐Ÿป๏ผˆไธๆ‡‚่ฉณ่งฃ็•ซ็ทš่™•็š„ๅŽŸๅ› 

T'=1โ‚+12=1+ โˆš2 v At=0. = =(1+ g 2 g g ๆ•…็ฌฌ0 ไพ้กŒ็›ฎ้ธ้ …,ๅƒ…(B)็‚บ็ญ”ๆกˆใ€‚ 2.1 0.1 ใ€‚ 6. ๅœจ็ฉบไธญ่€Œไธๅœจๆ‰‹ไธญ็š„็ƒ่‡ณๅฐ‘ๆœ‰4้ก†,ๅฏ ่ƒฝๆ˜ฏ4้ก†ๆˆ–5้ก†ใ€‚ๅœ–(a)ๆ‰€็คบ็‚บ4้ก†็ƒ ๅœจ็ฉบไธญ็š„่‡จ็•Œ็‹€ๆณ(ไน‹ๅพŒ่ฎŠๆˆ5้ก†ๅœจ ็ฉบไธญ),ๅœ–(b)ๅ‰‡็‚บ5้ก†็ƒๅœจ็ฉบไธญ็š„่‡จ ็•Œ็‹€ๆณ(ไน‹ๅพŒ่ฎŠๆˆ4้ก†็ƒๅœจ็ฉบไธญ) ่จญๆฏไธ€ๅฐ็ƒๅœจ็ฉบไธญ็š„ๆ™‚้–“็‚บ,ๅœ–(a)ใ€ (b)ไธญ5่™Ÿ็ƒ็š„้ฃ›่กŒๆ™‚้–“ๅณ็‚บๅฐ็ƒๅœจ็ฉบ ไธญ็š„ๆ™‚้–“ใ€‚็”ฑๅœ–(a)(b)ๅฏ็Ÿฅ,ๅฐ็ƒๅœจ็ฉบ ไธญ็š„ๆ™‚้–“ๅฟ…ๅคงๆ–ผ40,ไฝ†ๆ‹‹ๅ‡บ5ๅ€‹็ƒ็š„็ธฝ ๆ™‚้–“็‚บ5โ„ƒ,ๆ•…ๅฐ็ƒๅœจ็ฉบไธญ็š„ๆ™‚้–“ๅฟ…ๅฐๆ–ผ 5T 4T < t < 5tยฐ , ็”ฑ็ฌฌ 0 a= 30 2.(1)็›ธ้„ฐ T= (2)ไปค็ทš 12.5 ่™Ÿ6 V
E 4 28" 8 6.ๆŸไธ€้›œๆŠ€่กจๆผ”่€…็”จไบ”้ก†็›ธๅŒ็š„ๅฐ็ƒๅšๅ–ฎๆ‰‹ๆ‹‹็ƒ่กจๆผ”,็”ฑๅŒไธ€้ซ˜ๅบฆไพๆฌก ๅฐ‡ๅ„็ƒ็•ฅๅพฎๅ้›ข้‰›็›ดๆ–นๅ‘ใ€ๅ‘ไธŠๆ‹‹ๅ‡บ,็•ถ็ƒๅ›žๅˆฐๅŽŸๆœฌ่ขซๆ‹‹ๅ‡บ็š„้ซ˜ๅบฆๆ™‚, ไปฅๅŒไธ€้šปๆ‰‹ๅฐ‡็ƒๆŽฅไฝ,็„ถๅพŒๆฐดๅนณ็งปๅ‹•ๅˆฐๆ‹‹ๅ‡บ้ปž,ๅ†ๆ‹‹ๅ‡บ,ๅฆ‚ๅœ–ๆ‰€็คบ็š„ ้€†ๆ™‚้‡่ปŒ่ทกใ€‚ๆฏๆฌกๆ‹‹็ƒ็š„ๆ™‚้–“้–“้š”ๅ›บๅฎš็‚บ,ๅˆ้€Ÿ็š„้‰›็›ดๅˆ†้‡็š†็‚บvo' ๅ„็ƒ็š„้‹ๅ‹•่ปŒ่ทก็›ธๅŒ,ๅฝขๆˆ้€ฃ็บŒ็š„ๅพช็’ฐใ€‚้Ž็จ‹ไธญ,ๅœจ็ฉบไธญ่€Œไธๅœจๆ‰‹ไธญ ็š„็ƒ่‡ณๅฐ‘ๆœ‰ๅ››้ก†ใ€‚ๅ‡่จญ้‡ๅŠ›ๅŠ ้€Ÿๅบฆ็š„้‡ๅ€ผ็‚บ,ไธ”็ฉบๆฐฃ้˜ปๅŠ›ๅฏๅฟฝ็•ฅ,ๅ‰‡ ไธ‹ๅˆ—้ธ้ …ไฝ•่€…ๆญฃ็ขบ? gt (A)vgๅฏไปฅๆ˜ฏ (B) v, ๅฏไปฅๆ˜ฏgt (C)ๆฏไธ€ๅฐ็ƒๅœจ็ฉบไธญ็š„ๆ™‚้–“ๅฏไปฅๆ˜ฏ 3t 2 (D) ๅฐ็ƒๅœจๆœ€้ซ˜้ปžๆ™‚้›ขๆ‹‹ๅ‡บ้ปž็š„้‰›็›ด่ท้›ขๅฏไปฅๆ˜ฏ 2 2 (E) ๅฐ็ƒๅœจๆœ€้ซ˜้ปžๆ™‚้›ขๆ‹‹ๅ‡บ้ปž็š„้‰›็›ด่ท้›ขไธ€ๅฎšๅคงๆ–ผ2gtยฒใ€‚ ใ€ˆ112ๅˆ†็ง‘,็ญ”ๅฐ็އ36% 2.
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