JEE Main Physics question
The energy required to accelerate a car from rest to 10 ms⁻¹ is E. What energy will be required to accelerate the car from 10 ms⁻¹ to 20 ms⁻¹?
Answer: (B)
Solution
E = ½m(10²) = 50m. Energy for 10→20 ms⁻¹ = ½m(20²−10²) = ½m(300) = 150m = 3E.