Материальная точка движется прямолинейно по закону найти значение времени t, при котором ускорение точки равно 4 м/с². решите подробно, т.к. мне надо будет объяснить как решал, если есть какие нибудь формулы по решению напишите их тоже, ! ​

ответ:

объяснение:   ускорение точки а(t)=v'(t)  

скорость точки v(t)=x'(t)  

x'(t) =1/3*3t^2-3*2t+3=t^2-6t+3=v(t)

v'(t)   =2t-6=а(t)

а(t)=4     2t-6=4     2t=10 t=5

ускорение - есть вторая производная от пути по времени .

по условию ускорение равно 4 м/c²

4 = 2t - 6

2t = 10

t = 5

ответ : ускорение точки равно 4 м/c² в момент времени t = 5 c

1yes, it was great 2it was only three o'clock in the afternoon when we got there 3so we watched as they(группа) were setting up the speakers for the sound system 4since we had helped earlier we were allowed to sit at the edge of the stage.8 john: as for me, i was happy because i had had the chance to see my favourite band and talk to svyatoslav in front of five thousand people. terry: i felt exhausted, but also delighted. i enjoyed the concert very much. 5 the best moment of the concert for me was when svyatoslav vakarchuk and his team appeared. i couldn't believe it when he walked out. i felt very excited to be so close to my favourite singer.6 told us to enjoy the show.7 he(солист) started singing all of his hits. we all joined him and danced to the music. 9 speak about music and favourite singers

A-b=4                                                             a=b+4 a*b=12   решаем методом подстановки         (b+4)*b=12       b^2+4b-12=0 найдём дискриминант   d=4^2-4*1*(-12)=16+48=64=8*2 b(1)=(-4-8)/2< 0                 b(2)=(-4+8)/2=4/2=2             b=2 .     a=b+4=2+4=6 a+b=6+2=8

А) а^{3} + 8 = a³ + 2³ = (a + 2)(a² - 2a + 4) б) 8n^{3} - 27 = (2n)³ - 3³ = (2n - 3)(4n² + 6n + 9) в) p^{3} - 64p^{3} =  -  63p³  или, можно и по  формулам     p^{3} - 64p^{3}  =  p³ - (4p)³ = (p - 4p)(p² + 4p²  + 16p²) = - 3p(21p²) =  -    63p³  2. представьте в виде многочлена стандартного вида: (а + 4b)³  + (a - 4b)³ = (a + 4b + a - 4b)](a + 4b)² - (a + 4b)(a - 4b) + (a - 4b)²] =  = 2a[a² + 8ab + 16b² - a² + 16b² + a² - 8ab + 16b²] = = 2a(a² + 48b²)