Score: 3 Points
Our universe is continuously expanding. To measure its expansion, we use a time-dependent parameter called the scale factor. It works in such a way $\delta x=a(t)\delta x_0$
Using this we can find a relation,
$\dot a(t)/a(t) \propto 1/(a(t))^p$
Determine the value of P.
Note: Total energy is zero.