A particle of mass 1 kg is moving in the xy-plane whose position at an instant t is r=3sin 2î+3(1cos2t)ĵ. where r is in metre and t is in second. The kinetic energy of the particle at instant t is [more than one choice is correct]
(1) 4.5 J
(2) 10.5
(3) 18 d
(4) Does not depend on the time