S =a*t^2 / 2
a = 2*S/t^2 = 2*2500/625=8м/с^2
Дано
S1=4 000 м
t1=240 c
S2=6 000 м
2t1=t2
Vc-?
Vc=S/T
T=t1+t2=3*t1
S=S1+S2=4000+6000=10 000 м
Vc=10000/3*240=13.9 м/с
Q = q*m = 46,2*10⁶*0,200 = 9,24*10⁶ Дж
![F](https://tex.z-dn.net/?f=F)
эл. =
![Eq = ma](https://tex.z-dn.net/?f=Eq+%3D+ma)
(т. к. любую силу можно представить через II закон Ньютона)
![a = \frac{Eq}{m} S = v_{0}t + \frac{at^2}{2}](https://tex.z-dn.net/?f=a+%3D++%5Cfrac%7BEq%7D%7Bm%7D+%0A%0AS+%3D++v_%7B0%7Dt+%2B++%5Cfrac%7Bat%5E2%7D%7B2%7D)
![S = \frac{at^2}{2}](https://tex.z-dn.net/?f=S+%3D++%5Cfrac%7Bat%5E2%7D%7B2%7D+)
(т. к.
![v_{0} = 0](https://tex.z-dn.net/?f=v_%7B0%7D+%3D+0+)
)
![\frac{d}{2} = \frac{at^2}{2}](https://tex.z-dn.net/?f=+%5Cfrac%7Bd%7D%7B2%7D+%3D++%5Cfrac%7Bat%5E2%7D%7B2%7D+)
(т. к. шарик поместили посередине)
![d = at^2 t^2 = \frac{d}{a} t = \sqrt{\frac{d}{a}} t = \sqrt{\frac{dm}{Eq}} t = \sqrt{\frac{0,1 * 0,04}{10^{5} * 10^{-6}}} = 0.2](https://tex.z-dn.net/?f=d+%3D+at%5E2%0A%0At%5E2+%3D++%5Cfrac%7Bd%7D%7Ba%7D+%0A%0At+%3D+%5Csqrt%7B%5Cfrac%7Bd%7D%7Ba%7D%7D%0A%0At+%3D+%5Csqrt%7B%5Cfrac%7Bdm%7D%7BEq%7D%7D%0A%0At+%3D+%5Csqrt%7B%5Cfrac%7B0%2C1+%2A+0%2C04%7D%7B10%5E%7B5%7D+%2A+10%5E%7B-6%7D%7D%7D++%3D+0.2)