$4.2 \textrm{ rad/s}^2$ $a_R = 130 \textrm{ m/s}^2 \textrm{, } a_{tan} = 1.3 \textrm{ m/s}^2$ Giancoli 7th Global Edition, Chapter 8, Problem 14(2:28) Chapter 8, Problem 14 is solved. Start My Free Week View sample solution