2 2 5 (A)。高度位能=彈簧位能, mgh 12kx = 2 ,10×9.8×1= 12Kx 12mV ×1600×(0.1) = 12×1×V = , 2 2 12 V =102 m/s 1 2 ∴V=4 m/s 7 (B)。位能 A +動能 A =位能 B +動能 ...
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