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The only force that's horizontal is the horizontal component of the tension. That's this Tx. But, again, instead of just plugging in Tx, we'll plug in what this component is. in terms of the angle and the total tension. Just like we did over here. Ty was T cosine thirty. The formula for calculating acceleration is: [math]a(t) = dv(t)/dt [/math] or also more simply[math]: a = v/t[/math] Also, you can utilize (depending on the situation) newton’s second law equation which is: [math]Force = mass × acceleration[/math]... In the absence of air resistance, why does the horizontal component of velocity for a projectile remain constant while the vertical component changes? Because the horizontal component has no forces while the vertical component has a force of gravity that increases the directions.