A car accelerates from rest to speed u using energy E. Find n if the energy required to accelerate it from u to 2u is nE.

Question

G1 Physics · Accepted Answer

Energy required from rest to u: E = ½ μ \mu μ ² Additional energy required from u to 2u: ΔE = ½m(2u)² - ½ μ \mu μ ² = ½m(4u² - u²) = 3/2 μ \mu μ ² Since E = ½ μ \mu μ ², ΔE = 3E Therefore, n = 3 Final answer: 3.