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A car of mass 800kg attains a speed of 25m/s in 20 secs. The power...

Physics
JAMB 1999

A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

  • A. 1 . 25 x 104 W
  • B. 2 . 50 x 104 W
  • C. 1 . 25 x 106W
  • D. 2 . 50 x 106 W
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Correct Answer: Option B
Explanation

Power = Force x \(\frac{distance}{time}\) = \(\frac{m(v - u)}{t} \times v\)

\(\frac{800(25 - 0)}{20} \times 25\)

= 2.5 x 10\(^{4}\) watts


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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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