In the laboratory frame $K_{0}$, the slower particle has momentum

$$
m \gamma_{1} v_{1}=m \gamma_{1} \beta_{1} c=5 m c
$$

giving

$$
\gamma_{1} \beta_{1}=\sqrt{\gamma_{1}^{2}-1}=5
$$

or

$$
\gamma_{1}^{2}=26
$$

Hence

$$
\beta_{1}^{2}=1-\frac{1}{26}=\frac{25}{26}, \quad \text { or } \quad v_{1}=\sqrt{\frac{25}{26}} c \text {. }
$$

Similarly for the faster particle, the velocity is

$$
v_{2}=\sqrt{\frac{100}{101}} c
$$

Let $K_{1}, K_{2}$ be the rest frames of the slower and faster particles respectively. The transformation for velocity between $K_{0}$ and $K$, which moves with velocity $v$ in the $x$ direction relative to $K_{0}$, is 

$$
u_{x}^{\prime}=\frac{u_{x}-v}{1-\frac{u_{x} v}{c^{2}}} .
$$

Thus in $K_{1}$, the velocity of the faster particle is

$$
v_{2}^{\prime}=\frac{v_{2}-v_{1}}{1-\frac{u_{2} v_{1}}{c^{2}}}=\left(\frac{\sqrt{\frac{100}{101}}-\sqrt{\frac{25}{26}}}{1-\sqrt{\frac{100}{101} \cdot \frac{25}{26}}}\right) \mathrm{c}=0.595 \mathrm{c}
$$

In $K_{2}$, the velocity of the slower particle is

$$
v_{1}^{\prime}=\frac{v_{1}-v_{2}}{1-\frac{v_{1} v_{2}}{\mathrm{c}^{2}}}=-0.595 \mathrm{c} \text {. }
$$
Two particles with the same mass $m$ are emitted in the same direction, with momenta $5 m c$ and $10 m c$ respectively. As seen from the slower one, what is the velocity of the faster particle? ($c=$ speed of light.)