Question

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.​

Answer 1

Step-by-step explanation:

so that u multiple in this formula

Answer 2

• 362.88 kJ

Step-by-step 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