3. Mary is making a Berry tart in her electric stand mixer (see right). The mixer is rotating at a higher speed when she turns it off. The mixer makes K rotations (K is a number) before coming to a stop after a time T. [20 points] a. Derive the equation for the angular acceleration of the mixer as it came to a stop. This is the variable [8 points] Use these variables below your derivation. Your equation should only involve these variables (and numbers or physics constants). K is the number of rotations before stopping T is the time to stop b. Calculate the acceleration if the mixer made 3.50 rotations and stopped in 1.42 seconds. [3 pts] c. Before bring turned off, the mixer's had initial rotational kinetic energy KE rot. Derive the equation for the mixer's moment of inertia. Your equation should involve the variables KErot, K and T (and numbers or physical constants). [ 6 points ] d. Calculate the moment of inertia if the initial rotational kinetic energy was 1.2J. [ 3 points ]