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if an object is dropped from a tall building and hits the ground 3.0 s.…

Question

if an object is dropped from a tall building and hits the ground 3.0 s. later, what is the magnitude of the objects displacement in 1.0 s.; in 2.0 s.? 1.0 s. = 4.9 m 2.0 s. = m 39 9.8 20.

Explanation:

Step1: Identificar la fórmula

La fórmula para el desplazamiento de un objeto en caída libre es $d = v_0t+\frac{1}{2}gt^2$. Dado que el objeto es soltado, $v_0 = 0$. Entonces la fórmula se reduce a $d=\frac{1}{2}gt^2$, donde $g = 9.8\ m/s^2$.

Step2: Calcular el desplazamiento a $t = 2.0\ s$

Sustituir $t = 2.0\ s$ y $g = 9.8\ m/s^2$ en la fórmula $d=\frac{1}{2}gt^2$.
$d=\frac{1}{2}\times9.8\times(2.0)^2$
$d = 4.9\times4$
$d = 19.6\approx20\ m$

Answer:

$20$