1. The problem statement, all variables and given/known data The 100 kg blcok in the figure takes 5.40 s to reach the floor after being released from rest. What is the mass of the block on the left? 2. Relevant equations F=ma sf=si + (1/2)(a)(delta t) 3. The attempt at a solution I know to find acceleration you use sf=si + (1/2)(a)(delta t) 0=1+(1/2)(a)(5.4) a = 0.0686 m/s2 and then the F=ma to find the force on the block of known mass. F=(100 kg)(0.0686) F=6.86 but from this I am not sure how to determine the mass of the block on the left?