A car of mass 800kg attains a speed of 25m/s in 20 secs. ...
A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is
1 . 25 x 104 W
2 . 50 x 104 W
1 . 25 x 106W
2 . 50 x 106 W
Correct answer is 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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