Position/cm5.0010.0015.0020.0025.00 t/s 3 Average T/s2 midr+mmd ∧04gcm12 Position / cm 5.00 10.00 15.00 20.00 25.00 t / s (5T) 1 2 3 Average T 2 /s2 m1d1 2 +m2d2 2 /104 g·cm2