To calculate the velocity of ball with respect to the ground we need to add velocity of the car and relative velocity of ball in respect to the car (but via relativistic velocity-addition formula):
u=v+u′1+vu′c2=3c/5+c/21+310=1110⋅1013c=1113cu = \frac{v+u'}{1+ \frac{vu'}{c^2}} = \frac{3c/5+c/2}{1+ \frac{3}{10}}= \frac{11}{10} \cdot \frac{10}{13} c = \frac{11}{13} cu=1+c2vu′v+u′=1+1033c/5+c/2=1011⋅1310c=1311c
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