**1.Two rockets of rest length L0 are approaching the
earth from opposite directions at velocities ±0.6c. How fast
(velocity) does one of them appear to the other?**

**1.2 c**

**C**

**0.9c**

**0.8c**

2.

**For 7.6% accuracy, What does an electron have this
kinetic energy in MeV needed to be treated relativistically? Hint:
The rest mass energy of an electron is 0.511
MeV. **

**Express your answer in exponential form (example:
scientific notation using E-7 for 10-7) to three significant
figures and in the unit of MeV. Do not enter the unit**

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(1)\begin{aligned}U_{x} & =0.6 c \\V^{\prime} & -0.6 c \\U_{x}^{\prime} & =\frac{u_{x}-4}{1-\frac{U_{x y} U}{c^{2}}}=\frac{0.6 c-(-0.6 c)}{1-\frac{(0.6 c)(-0.6 c)}{c^{2}}} \\\Rightarrow U_{x}^{\prime} & =\frac{1.2 c}{1+\frac{0.36 c^{2}}{e^{2}}}=\frac{1.2 c}{1.36}=0.88 c \\\quad U_{x}^{\prime} & =0.8 c \text { option d }\end{aligned} ...