#### 5,220
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- \( V_5 = 10,000 \cdot 0.85^4 \)
- Calculate \( 0.85^4 \approx 0.52200625 \)
- \( V_5 = 10,000 \times 0.52200625 = 5,220.0625 \), approximately 5,220 views.
- A physics teacher explains kinetic energy: \( KE = \frac{1}{2}mv^2 \). If a 1200 kg car speeds up from 10 m/s to 30 m/s, by how much does its kinetic energy increase?
- Initial KE: \( \frac{1}{2} \cdot 1200 \cdot 10^2 = 600 \cdot 100 = 60,000 \) J
- Final KE: \( \frac{1}{2} \cdot 1200 \cdot 30^2 = 600 \cdot 900 = 540,000 \) J
