physics

A 1000 kg car can accelerate from rest to a speed of 25 m/s in 10 s. What average power must the engine of car produce in order to cause this acceleration? Neglect friction losses

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  1. M*g = 1000 * 9.8 = 9800 N. = Wt. of car.
    a = 25/10 = 2.5 m/s^2.

    d = 0.5a*t^2 = 1.25*10^2 = 125 m.

    P = F * d/t = 9800 * 125/10 = 122,500J/s = 122,500 Watts.

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  2. First find k.E=1/2mv'2
    K.e=1/2 1000x (25)2=
    E=312500 j
    Now
    P=E/t
    P=312500/10=31250
    Now convert in kilo
    31250/1000=31.25 thanks

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  3. Answer given by nazish is correct.

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