The power of engine of a car of mass 1200 kg is 25 kW. The minimum time required to reach a velocity of 90 km/h by the car after starting from rest is
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Answered by
211
See the attachment for relation between power,work and time.
We got answers t =15 s.
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bhanujkataria19:
Nice
how
what is the use of mass given if it is not required
Mass is used
Answered by
183
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.
Hope it helps.
thnku so much sir
plz tell that what was the need to give mass if it is not required
Sir actually mass is nedded to find the work done as formula of power is work/time to find the work done mass is required in formula 1/2 mv^2
is that correct sir
Yes correct answer
correct
how to find work done
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