Three cannons are located at the top of a cliff above a level plain. Cannon A is aimed at an angle of 25° above the horizontal and shoots cannonballs with a speed of 85 m/s. Cannon B is aimed directly horizontally and shoots with a speed of 100 m/s. Cannon C is aimed 25° below the horizontal and shoots with a speed of 75 m/s. Which of the cannonballs will hit the ground with the greatest speed? The three cannonballs are not necessarily the same mass.

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