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1. ### Constant acceleration problem

Up an down times are equal so begin by solving for descent data. At 76.1cm, vertical velocity is zero. Solve your second equation for s. Becomes your time equation. Calculate velocity after falling 14.4cm. This can be plugged into vi in the time equation to determine seconds falling...
2. ### Free-Body diagram of block on plane; both move

Friction is what makes the block track with the incline plane at its upper part . Normally, the force vector applied would be purely gravity-enforced. Friction would be applied straight upward. In the case of your moving incline plane, the vector is no longer applied straight up but is...
3. ### Simple Suspended Weight Force

I believe you have it correct. The measurement point is insensitive to the location of the mass. Otherwise, you would need to consider such nonsense as the top half of each 1.0 N box versus its bottom half. Consider that your string is connected to the top of the heavy chain, light chain or...