A particle which is experiencing a force, given by F = 3 i – 12 j , undergoes a displacement of d = 4 i . If the particle had a kinetic energy of 3J at the beginning of the displacement, what is its kinetic energy at the end of the displacement?
(1) 10 J
(2) 9 J
(3) 15 J
(4) 12 J
