Um corpo de massa 40Kg está submetido a ação de duas forças de 6400N e 4000N , qual será o valor da aceleração: se as forças tem a mesma direção e o mesmo sentido? E se as forças tem a mesma direção e sentidos contrários? De acordo com a Segunda lei de Newton (Fr=m. a), em qual alternativa o valor da aceleração nos seguintes casos está correto respectivamente? * 10 pontos
260N e 60N
100N e 160N
60N e 260N
160N e 100N
260N e 100N

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r