part 1 of 2 The motor driving a grinding wheel with a rotational inertia of 0.8 kg m- is switched off when the wheel has a rotational speed of 39 rad/s. After 6.7 s, the wheel has slowed down to 31.2 rad/s. What is the absolute value of the constant torque exerted by friction to slow the wheel down? Answer in units of N m. Answer in units of N m. part 2 of 2 If this torque remains constant, how long after the motor is switched off will the wheel come to rest? Answer in units of s. Answer in units of s