Consider the belt and pulley system, the pulley radius is 0.09 m and the motor inertia is J_m= 0.01 kg*m^2. Calculate the equivelent torque of the motor (T_em) required to accelerate a load of 1.0 kg from rest to a speed of 1 m/s in a time of 4 sec. Assume motor torque to be constant during this interval.