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JAMB Physics 2021 Paper

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Question : 23

Total: 40

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

Solution:

P = $\frac{mv^{2}}{t} = \frac{800 \times 25 \times 25}{20}$

2.5 x 10 $^{4}$ W

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