Force acting on a particle is given by F→=a→×P→, where ,a→   is a constant vector and  P→ is linear momentum of the particle. Choose the correct option(s):

F→=a→×P→F→  is always perpendicular to   P→So , It can’t change speed hence KE is also constant.P→ will change its direction. |F→| will be constant; so particle will move on a circular trajectory.