在利用自由落体“验证机械能守恒定律”的实验中， （1）下列器材中不必要的一项是 （只需填字母代号）． A

解：
（1）
A
（2）
电源频率为50Hz说明每0.02秒打一点，同时落体法验证机械能守恒每个点都是一个计数点
Vb=(OC-OA)/(0.04)=3m/s
ΔEp=mgOB=0.687J
ΔEk=mVb^2/2=4.5J
如果没有计算错，那么应该就是有问题了
假设不受阻力，如果速度到达3m/s
那么2gH=v^2-0，H=0.45m=45cm，就算有误差也不会差那么大吧
要不然你把图发来，可能它这里的计数点选择不一样，那样的话那里的时间就不是0.04s

第二个题的答案：AC

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