A particle moving in the xy plane experiences a velocity-dependent force, where vₓ and vᵧ are the x and y components of its velocity v . If α is the acceleration of the particle, then which of the following statements is true for the particle?
A. the kinetic energy of the particle is constant in time
B. quantity v x α is constant in time
C. Quantit v. αis constant in time
D. F arises due to a magnetic field