the power of engine car of mass 1200 kg is 25 kilowatt the minimum time required to reach a velocity of 90 km per hour by the car after starting from the rest is
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Velocity = 90 km/hr = 25 m/s.
Power = 25 kW = 25,000 W.
Work = Kinetic energy
∴ W =1/2 mv²
⇒ W = 375000
Since, Power = Work/time.
⇒ Time = Work/Power
⇒ Time = 375000/25000
∴ t = 15 s.
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15 seconds is the minimum time
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lakshay81216:
Thank u sir
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