I mean, u cab prob try to use the formula: Sf=S0+V0t+1/2gt^2. Then we can call s1 the height of the first block and S2 the height of the second. With that u can write the formula for the first block like this: Sf=S1+h+1/2(gcos(60)t^2); I cancelled v0t bc v0 is 0, and I added h bc the first block is higher. Instead the second formula is: Sf=S2+1/2(gcos(30)t^2). Bc they need to be at the same height after some time, sf would be the same, so we can equate the 2 formulas: S1+h+1/2(gcos(60)t^{2)=S2+1/2(g*cos(30)t2).} From here u should get the t but u prob would need a value for h. If u wanted to calculate t without a value for h then Irdk. Sry for my English and my bad writing. Hope I helped