The disk rotates at $9$ rad$/$s and has a radius of $1\mathrm{.}41$ feet. It then experiences a constant angular acceleration of $8\mathrm{.}958$ rad$/$s$^2.($Given: Time $=1\mathrm{.}001$ s$)$Part A Determine the magnitude of the velocity at Point A in the units of $($ft$/$s$).$Part B Determine the magnitude of the acceleration at Point A in the units of $($ft$/$s$^2).$Please show & detail all steps and calculations.