A car of mass 800kg attains a speed of 25m s in... - JAMB Physics 1999 Question
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 Option: B
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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