A car is moving on a horizontal road at a constant speed of 200 m/sec If the frictional resistance is equal to 2500 Newtons, what is the engine capacity of the car when the air resistance is neglected?
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Answer:
Explanation:
No, there is no work done in this case. Since it is in uniform motion, there is a constant speed.
And according to the work - energy theorem,
Work done = ∆KE = ½ m(v² - u²)
⇒ W = ½ m(v² - v²) (v = u; you can find it through v = u + at equation)
⇒ W = ½ m × 0 = 0.
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