A three$-$phase induction motor, $380$ V$,50$ Hz$,4$ poles, is used to drive an electric train. The electric train requires a thrust force of $(30+[$your attendance number$])$ kN at a speed of $85$ km$/$h$.$ Under this condition, the motor rotates at a speed of $1440$ rpm$.$

a$.$ What are the required motor power and torque?

b$.$ If the motor$$s maximum torque occurs at a rotational speed of $1050$ rpm$,$ what is the value of the motor$$s maximum torque?

c$.$ How can the train move in reverse? Explain.