what is the energy equivalent of an object with a mass of 2.5 kg?\no 5.5×10^8 j\no 7.5×10^8 j\no 3.6×10^16…

Explanation:

Step1: Recall Einstein's mass - energy equivalence formula

$E = mc^{2}$, where $E$ is energy, $m$ is mass, and $c$ is the speed of light ($c = 3\times10^{8}\ m/s$).

Step2: Substitute the given values

Given $m = 2.5\ kg$ and $c = 3\times10^{8}\ m/s$, we have $E=2.5\times(3\times 10^{8})^{2}$. First, calculate $(3\times 10^{8})^{2}=3^{2}\times(10^{8})^{2}=9\times10^{16}$. Then, $E = 2.5\times9\times10^{16}=22.5\times10^{16}=2.25\times 10^{17}\ J$.

Answer:

$2.25\times 10^{17}\ J$ (the fourth option)