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Un automóvil lleva una velocidad inicial de \( 20 \mathrm{~km} / \mathrm{h} \) al norte y a los 4 segundos su velocidad es de \( 50 \mathrm{~km} / \mathrm{h} \) Calcular: Su aceleración y su desplazamiento en ese tiempo

Ask by Coleman Haynes. in Mexico
Feb 27,2025

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La aceleración es de aproximadamente 2.08 m/s² y el desplazamiento es de aproximadamente 38.9 metros en 4 segundos.

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Para calcular la aceleración, utilizamos la fórmula: \[ a = \frac{v_f - v_i}{t} \] donde \( v_f \) es la velocidad final (50 km/h), \( v_i \) es la velocidad inicial (20 km/h) y \( t \) es el tiempo (4 sx). Primero, convertimos las velocidades a metros por segundo: - \( v_i = \frac{20 \times 1000}{3600} \approx 5.56 \, \text{m/s} \) - \( v_f = \frac{50 \times 1000}{3600} \approx 13.89 \, \text{m/s} \) Entonces, la aceleración: \[ a = \frac{13.89 \, \text{m/s} - 5.56 \, \text{m/s}}{4 \, \text{s}} \approx 2.08 \, \text{m/s}^2 \] Para el desplazamiento, utilizamos la fórmula: \[ d = v_i \cdot t + \frac{1}{2} a t^2 \] Sustituyendo los valores: \[ d \approx 5.56 \times 4 + \frac{1}{2} \times 2.08 \times 4^2 \approx 22.24 + 16.64 = 38.88 \, \text{m} \] Entonces, la aceleración es \( 2.08 \, \text{m/s}^2 \) y el desplazamiento es aproximadamente \( 38.88 \, \text{m} \).

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