82问答网 > 与打点计时器一样，光电计时器也是一种研究物体运动情况的常用计时仪器，其结构如图所示，a、b分别是光电

与打点计时器一样，光电计时器也是一种研究物体运动情况的常用计时仪器，其结构如图所示，a、b分别是光电

2025-04-01 20:50:51
推荐回答（1个）
回答1：

（1）滑块通过光电门1时的速度v1=

d
t1
=
5.00cm
5.00×10?2s
=1.00m/s
通过光电门2时的速度v2=
d
t2
=2.50m/s
（2）滑块通过光电门1、2之间的动能增加量△Ek=Ek2-Ek1=
1
2
mv22-
1
2
mv12=5.25J   
重力势能减小量△Ep=mgh=2.0×9.8×0.540J=5.29J．
故答案为：（1）1.00；2.50；（2）5.25；5.29．

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