Jean asked in Science & MathematicsPhysics · 6 months ago

what is the average power generated by a 1200 kg car as it accelerates from rest to 20 m/s in 10 s?

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  • MyRank
    Lv 6
    6 months ago

    Given,

    Average Power (Pavg) =?

    Mass (m) = 1200 kg

    Initial Velocity (u) = 0m/sec

    final Velocity (v) = 20 m/sec

    Time (t) = 10 sec

    We know that,

    Average Power (Pavg) = Energy change/ Time

    = [½ m (Δv)²]/ Time (t)

    = m (v - u)²/ 2 x t

    = (1200 [20 - 0]²)/ 2 x 10

    = (1200 x 400)/ 20

    = 24000 W

    ∴ Average Power (Pavg) = 24 kw

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  • Anonymous
    6 months ago

    you eat fart and smell fart

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  • 6 months ago

    The first step is to calculate the car’s kinetic energy.

    Initial KE = ½ * 1200 * 20^2 = 240,000 J

    Power = 240,000 ÷ 10 = 24,000 watts

    • Andrew Smith
      Lv 7
      6 months agoReport

      which means 24 kW or about 31 Hp at the wheels. The engine develops more than this but some of the power is used for other purposes.

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  • 6 months ago

    Yeah, yeah..... just gimme the answer and I might award best answer but probably not.

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  • 6 months ago

    Two steps:

    1. Calculate the kinetic energy of the car at 20 m/s.

    2. Divide by the time to reach that speed.

    Watts are equivalent to Joules/sec

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