Ans. (i) 2000 J (ii) 1000 J 18. A truck weighing 1000 kgf changes its speed from 36 km h-¹ to 72 km h-¹ in 2 minutes. Calculate : (i) the work done by the engine, and (ii) its power. (g = 10 m s-2). Ans. (i) 1.5 x 105 J, (ii) 1-25 × 10³ W
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