问题
选择题
_____ more clearly, they came up and got close to it. [ ]
A. Seeing
B. Seen
C. To see
D. To be seen
答案
答案：C
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_____ more clearly, they came up and got close to it. [ ]
A. Seeing
B. Seen
C. To see
D. To be seen
答案：C
=37°的推力F ，F=100N，物体由静止开始向右运动。作用5s后撤去外力F。g取10m/s2。（其中sin37°=0.6，,cos37°=0.8）求：
作用下物体的加速度为多少？