Question

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​​

Answer 1

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 2

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