[单选题]
A 60-kg person walks on a 10 9k. ,sm8;lthey*bbb p7*nmy g0-kg log at78e.4*0 (j, ( imcejhqkbbaa 7hvgli d-:soat the rate of 0.80 m/s (with respect to the log). With what speed does the log move, with:t*(.8ga-j(se 0j4id h 7ec7ov ah ablbkq,mi respect to the shore?
