jika ek 25% energi diamnya maka kecepatan benda

TRK
• Energi

Eₖ = 25% Eₒ = ¼ Eₒ → v = __?

Eₖ = E' - Eₒ
¼ Eₒ = E' - Eₒ
5/4 Eₒ = E'
5/4 mₒ c² = m' c²
5/4 mₒ = mₒ / √(1 - (v/c)²)
5/4 = 1 / √(1 - (v/c)²)
⅘ = √(1 - (v/c)²)
16/25 = 1 - (v/c)²
(v/c)² = 9/25
v/c = ⅗
v = ⅗ c ✔️