[填空题]
A farm boy studying ph/c* yecxhfnt)rof zw8vb 1,;5ysics believes that he can fit a 15.0-m-long sn.* -quftb - m1gy1 r2cw7ypvi8.)y ejwb2c jpole into a 12.0-m-long barn if he runs fast enough (carrying the pole). Can he do it? Ex e)n2ucb cvwypg--qf.71yt28b .wj *ism1jryplain in detail. How does this fit with the idea that when he is running the barn looks even shorter to him than 12.0 m?
