The acceleration experienced by a moving boat after is engine is cut-off, is given by 𝑎 = −𝑘𝑣3 , where 𝑘 is a constant. If 𝑣0 is the magnitude of velocity at cut-off, then the magnitude of the velocity at time 𝑡 after the cut off is

Question : The acceleration experienced by a moving boat after is engine is cut-off, is given by 𝑎 = −𝑘𝑣3 , where 𝑘 is a constant. If 𝑣0 is the magnitude of velocity at cut-off, then the magnitude of the velocity at time 𝑡 after the cut off is