Supiyanto Kelas X Evaluasi Bab 2 Nomor 9

Sebuah mobil bergerak dengan kelajuan 40 km/jam selama 2 jam, 50 km/jam selama 1 jam, dan 20 km/jam selama 0,5 jam, mempunyai kelajuan rata-rata sebesar …

A. 31 km/jam D. 45 km/jam
B. 35 km/jam E. 55 km/jam
C. 40 km/jam

Penyelesaian

Kelajuan rata-rata mobil

 

\displaystyle \bar{v}=\frac{\Delta s}{\Delta t}=\frac{{{s}_{1}}+{{s}_{2}}+{{s}_{3}}}{{{t}_{1}}+{{t}_{2}}+{{t}_{3}}}

\displaystyle \bar{v}=\frac{\left( 40\times 2 \right)+\left( 50\times 1 \right)+\left( 20\times \frac{1}{2} \right)}{2+1+\frac{1}{2}}

Jawaban C

Supiyanto. 2006. FISIKA UNTUK SMA KELAS X. Jakarta: Phiβeta.

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