\(\overrightarrow{p}=\overrightarrow{p_1}+\overrightarrow{p_2}\)
\(p=\sqrt{p^2_1+p^2_2+2p_1p_2cos\alpha}\)
Góc hợp bởi \(\overrightarrow{p_1},\overrightarrow{p_2}\) là \(\alpha\)
\(a.\alpha=0^0\)
\(p=p_1+p_2=m_1v_1+m_2v_2=0,2.5+0,3.2=1,6\left(kg.\frac{m}{s}\right)\)
\(b.\alpha=180^0\)
\(p=p_1-p_2=0,4\left(kg.\frac{m}{s}\right)\)
\(c.\alpha=90^0\)
\(p=\sqrt{p^2_1+p^2_2}=1,17\left(kg.\frac{m}{s}\right)\)
\(d.\alpha=60^0\)
\(p=\sqrt{p_1^2+p_2^2+2p_1p_2cos60^o}=1,4\left(kg.\frac{m}{s}\right)\)
\(e.\alpha=120^0\)
\(p=\sqrt{p^2_1+p^2_2+2p_1p_2cos120^o}=0,87\left(kg.\frac{m}{s}\right)\)
