Round 10: Tossup 3

Two values of this quantity times a Christoffel symbol plus another quantity equals zero in the geodesic equation. Replacing this quantity with rapidity linearizes (15[1])Einstein’s nonlinear formula for adding it. The reciprocal of the slope (15[1])of a worldline (15[1])equals this quantity. This quantity is squared in the numerator of (*) relativistic beta, which appears (-5[1])in the Lorentz factor. (-5[1])Non-gravitational time dilation occurs when this quantity is different for two observers. (-5[1])In relativity, forces increase mass because this (-5[1])quantity cannot exceed a universal (10[1])limit denoted c. (0[1])For 10 points, what quantity has units of meters per second? ■END■ (10[3])

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