In which accelerated motion , the kinetic energy of a particle remain constant ?

Statement 1: A charged particle undergoes non-rectilinear motion in a constant magnetic field. The only force acting on the particle is the magnetic force. Then kinetic energy of this particle remains constant but momentum of the particle does not remains constant. Statement 2: A force that always acts on the particle in direction perpendicular to its velocity does no work on the particle. But whenever a force acts on the particle, momentum of the particle does not remains constant.

A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration. What is the magnitude of this acceleration, if the kinetic energy of the particle becomes equal to 8xx10^(-4) J by the end of the second revolution after the beginning of the motion?

A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration. What is the magnitude of this acceleration, if the kinetic energy of the particle becomes equal to 8xx10^(-4) J by the end of the second revolution after the beginning of the motion?

In which motion momentum change but kinetic energy does not ?

A particle of mass 10 g moves along a circle of radius 64 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to 8xx10^(-4)J by the end of the second revolution after the beginning of the motion ?

A particle of mass 10g moves along a circle of radius 6.4 cm with a constant tangential acceleration . What is the mafnitude of this acceleration if the kinetic energy of the particle becomes equal to 8xx10^(-4)J by the end of the second revolution after the beginning of the motion?