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Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.

1 vote

Projectile motion launched at an angle and landing higher than start

For projectiles, the equations of motion can be separated into the horizontal and vertical motions: $$x(t) = V_x*t$$ $$y(t) = V_y*t-\frac 12*g*t^2$$ If this figure is reasonable for the problem, then …
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Free Form Diagram of one block on top of another block

Now in Block B, why does N1 considered act downwards? N1 is determined from the free body diagram (FBD) of block A. The direction is arbitrary, but it makes sense if N1 is pointed up on block A t …
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