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find the work done by the engine of a car which moves at an acceleration of 3 m / s2 for 8s. the mass of the car is 1400 kg, while the coefficient of fecundation of its wheels with the road is 0.03.​

Respuesta :

yabelogetu

Explanation:

so that u multiple in this formula

Ver imagen yabelogetu

Answer:

  • 362.88 kJ

Explanation:

Given

  • a = 3 m/s²
  • t = 8 s
  • m = 1400 kg
  • μ(k) = 0.03

Finding Displacement

  • S = ut + 1/2at²
  • S = 0 + 1/2(3)(8)²
  • S = 32(3) = 96 m

Finding Net Force

  • Applied Force (F) = ma = 1400 x 3 = 4200 N
  • Friction Force (f) = μmg = 0.03 x 1400 x 10 = 420 N
  • Net Force = F - f = 4200 - 420 = 3780 N

Work Done

  • W = FS = 3780 N x 96 m
  • W = 362880 J
  • W = 362.88 kJ