Expand the following: \begin{align} Ts_1 &= \cssId{Step1}{t_s1\bigg(\frac{F_b1}{m}+g·sinα\bigg).} \\[3px] &\cssId{Step2}{{} = \frac{v_0}{\frac{F_b1}{m}+g·sinα}} \\[3px] &\cssId{Step3}{{} =..Equation21..} \\[3px] \end{align}