What is work to be done to increase the velocity of a car from 36km/hr to 72km/hr if the mass of the car is 2000kg
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Answer:
Work = 3×10⁵ Joules
Explanation:
Initial Kinetic Energy (Ki) = (0.5)(2×10³)(10)² = 10⁵ J
Final Kinetic Energy (Kf) = (0.5)(2×10³)(20)² = 4×10⁵ J
Work Done = Alterations in Mechanical Energy, that is,
W = ∆E = Kf - Ki = 4×10⁵ - 10⁵ = 3×10⁵ Joules
Answer:
Work = 3×10⁵
➡️ initial kinetic energy (ki) = (0.5)(2×10³)(10)²= 10⁵J
➡️ Final Kinetic energy (kf) = (0.5)(2×10³)(20)²=4×10⁵ J
➡️Work done = Alterations in Mechanical Energy,that is
➡️W=∆ E = Kf-ki=4×10⁵-10⁵=3×10⁵ Joules