y=y0+v0t−gt22=0;v0=gt2−y0t=9.8ms2⋅2.5 s2−1.8 m2.5 s=11.53ms.y = y_0 + v_0t - \frac{gt^2}{2} = 0; \\ v_0 = \frac{gt}{2} - \frac{y_0}{t} = \frac{9.8\frac{\text{m}}{\text{s}^2}\cdot2.5\text{ s}}{2} - \frac{1.8\text{ m}}{2.5\text{ s}} = 11.53\frac{\text{m}}{\text{s}}.y=y0+v0t−2gt2=0;v0=2gt−ty0=29.8s2m⋅2.5 s−2.5 s1.8 m=11.53sm.
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