1. The problem statement, all variables and given/known data A pair of fuzzy dice is hanging by a string from your rearview mirror. While you are accelerating from a stoplight to 29 m/s in 5.7 s, what angle θ does the string make with the vertical? 2. Relevant equations v_f=v_0+a*t x_f=x_0+v_0*t+0.5a*t^2 v_f^2=v_0^2+2*a(x_f-x_0) x-x_0=[(v_0-v+v_f)/2]*2 And just sum of forces=0 F=ma Note: v_f^2 is final velocity squared 3. The attempt at a solution I'm lost because it seems to me that the mass of the dice must be known to solve?