Atraffic accident detective measures the skid marks left by a car, 825kg. he determines that the distance between the point that the driver slammed on the brakes and the point where the car came to a stop was 34.0 m. from a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. how fast was the car going when the driver applied the brakes? (this car was not equipped with anti-lock brakes.

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