Four particles have the following masses (in terms of m), speeds (in terms of v), and radii (in terms of r). Which two particles have the same centripetal force?
Particle Mass Speed Radius
1 m v r
2 m/4 2v r
3 2m v/2 r
4 3m 2v 3r
(A) Particle 1
(B) Particle 2
(C) Particle 3
(D) Particle 4