英文数学题，请大家帮忙，谢谢！
Acertainnumbertimes23andaddedto15isgreaterthan429.whatisthenumber?...
A certain number times 23 and added to 15 is greater than 429. what is the number ?
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设这个数是x
则23x+15>429
23x>414
x>18
则23x+15>429
23x>414
x>18
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Running at maximum speed v = 15 m/s, traction and resistance F F balance,
P = fv, f = 2000 n,
When the car speed v '= 10 m/s, the traction to F',
P = F 'v' and '= 3000 n, F
The acceleration is a = (F '-f)/m ^ 2 = 0.5 m/s
P = fv, f = 2000 n,
When the car speed v '= 10 m/s, the traction to F',
P = F 'v' and '= 3000 n, F
The acceleration is a = (F '-f)/m ^ 2 = 0.5 m/s
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