JAMB - Physics (2021 - No. 23)
A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?
1.25 x 10\(^{4}\)W
2.50x 10\(^{4}\)W
1.25 x 10\(^{6}\)W
2.50 x 10\(^{6}\)W
Giải thích
P = \(\frac{mv^{2}}{t} = \frac{800 \times 25 \times 25}{20}\)
2.5 x 10\(^{4}\)W