Chapter 11 - Rolling, Torque, and Angular Momentum - Problems - Page 322: 32

$\frac{d\mathscr{l}}{dt} = (2.0~N\cdot m)~\hat{i}-(4.0~N\cdot m)~\hat{j}$

We can find $\frac{d\mathscr{l}}{dt}$ in unit-vector notation: $\frac{d\mathscr{l}}{dt} = \tau_1+\tau_2$ $\frac{d\mathscr{l}}{dt} = (2.0~N\cdot m)~\hat{i}-(4.0~N\cdot m)~\hat{j}$