Sila i gibanje - 4.

$p_2=\frac{1}{2}{p}_{1}p\_\{2\}=\backslash frac\{1\}\{2\}\; p\_\{1\}$

$p_2=p_{1}p\_\{2\}=p\_\{1\}$

$p_2=2p_{1}p\_\{2\}=2\; p\_\{1\}$

$p_2=4p_{1}p\_\{2\}=4\; p\_\{1\}$