如图是“测平均速度”的实验装置，这个实验的原理是v=stv=st，必须测量的物理量是
\u5982\u56fe\u6240\u793a\uff0c\u5728\u201c\u6d4b\u5e73\u5747\u901f\u5ea6\u201d\u7684\u5b9e\u9a8c\u4e2d\uff1a\uff081\uff09\u672c\u5b9e\u9a8c\u7684\u539f\u7406\uff1av=stv=st\uff1b\uff082\uff09\u672c\u5b9e\u9a8c\u9664\u56fe\u4e2d\u6240\u793a\u7684\u5668\u6750\u5916\uff0c\u8fd8\uff081\uff09\u201c\u6d4b\u5e73\u5747\u901f\u5ea6\u201d\u7684\u5b9e\u9a8c\u539f\u7406\u662fv=st\uff1b\uff082\uff09\u6839\u636e\u6d4b\u91cf\u5e73\u5747\u901f\u5ea6\u7684\u539f\u7406\u53ef\u77e5\uff0c\u9700\u8981\u6d4b\u91cf\u659c\u9762\u957f\u548c\u8fd0\u52a8\u65f6\u95f4\uff0c\u9700\u8981\u7684\u6d4b\u91cf\u5de5\u5177\u6709\u523b\u5ea6\u5c3a\u548c\u79d2\u8868\uff1b\uff083\uff09v=st=0.78m2s=0.39m/s\uff0e\u6545\u7b54\u6848\u4e3a\uff1av=st\uff1b\uff082\uff09\u523b\u5ea6\u5c3a\uff1b\u79d2\u8868\uff1b\uff083\uff090.39\uff0e
\uff081\uff09\u5b9e\u9a8c\u4e2d\u8981\u5229\u7528\u516c\u5f0fv=st\u8ba1\u7b97\u5c0f\u8f66\u5e73\u5747\u901f\u5ea6\uff1b\u5b9e\u9a8c\u4e2d\u8981\u7528\u523b\u5ea6\u5c3a\u6d4b\u91cf\u5c0f\u8f66\u8fd0\u52a8\u7684\u8def\u7a0b\uff0c\u7528\u79d2\u8868\u6d4b\u91cf\u5c0f\u8f66\u8fd0\u52a8\u7684\u65f6\u95f4\uff1b\uff082\uff09\u82e5\u8981\u8ba1\u65f6\u65b9\u4fbf\uff0c\u5e94\u4f7f\u659c\u9762\u7684\u5761\u5ea6\u5c0f\u4e00\u4e9b\uff0c\u662f\u4e3a\u4e86\u51cf\u5c0f\u5c0f\u8f66\u8fd0\u52a8\u7684\u901f\u5ea6\uff0c\u4f7f\u5c0f\u8f66\u5728\u659c\u9762\u4e0a\u901a\u8fc7\u7684\u65f6\u95f4\u66f4\u957f\uff1b\uff083\uff09\u5c0f\u8f66\u6cbf\u659c\u9762\u9876\u7aef\u4e0b\u6ed1\u5230\u659c\u9762\u5e95\u7aef\u7684\u8fd0\u52a8\u65f6\uff0c\u901f\u5ea6\u8d8a\u6765\u8d8a\u5927\uff0c\u56e0\u6b64\u662f\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8\uff1b\uff084\uff09\u7531\u4e8e\u5c0f\u8f66\u5728\u4e0b\u6ed1\u8fc7\u7a0b\u4e2d\u505a\u52a0\u901f\u8fd0\u52a8\uff0c\u6240\u4ee5\u4e0a\u534a\u6bb5\u7684\u5e73\u5747\u901f\u5ea6\u6700\u5c0f\uff0c\u4e0b\u534a\u6bb5\u7684\u5e73\u5747\u901f\u5ea6\u6700\u5927\uff0c\u5168\u7a0b\u7684\u5e73\u5747\u901f\u5ea6\u5c45\u4e2d\uff1b\uff085\uff09\u5982\u679c\u8ba9\u5c0f\u8f66\u8fc7\u4e86A\u70b9\u624d\u5f00\u59cb\u8ba1\u65f6\uff0c\u4f1a\u5bfc\u81f4\u65f6\u95f4\u7684\u6d4b\u91cf\u7ed3\u679c\u504f\u5c0f\uff0c\u7531\u516c\u5f0fv=st\u53ef\u77e5\uff0c\u5e73\u5747\u901f\u5ea6\u4f1a\u504f\u5927\uff0e\u6545\u7b54\u6848\u4e3a\uff1a\uff081\uff09v=st\uff1b\u523b\u5ea6\u5c3a\uff1b\u79d2\u8868\uff1b \uff082\uff09\u8f83\u5c0f\uff1b\u659c\u5761\u5761\u5ea6\u8d8a\u5927\uff0c\u5c0f\u8f66\u8fd0\u52a8\u5230\u5e95\u7aef\u6240\u7528\u65f6\u95f4\u8d8a\u77ed\uff0c\u8d8a\u4e0d\u6613\u8ba1\u65f6\uff1b\uff083\uff09\u53d8\u901f\uff1b \uff084\uff09V3\uff1eV1\uff1eV2\uff1b\uff085\uff09\u5927\uff0e
本实验依据的原理是v=| s |
| t |
小车通过的路程s=80cm+5cm=85cm，小车滑动的时间t=12：30：10-12：30：00=10s，
小车的速度：v=
| s |
| t |
| 0.85m |
| 10s |
故答案为：v=
| s |
| t |
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