1、 - 1 - 06 1. 2017 v m=3kg v0=5m/s A 0.2 AB L=6m g=10m/s 2 A B A. B. 6m/s C. v=3m/s I=10N D. 36J 8 AD a=2m/s 2 v0=5m/s A v0 2 -v 2 =2aL v=1m/s v= 1 2 5+1 m/s =3m/s A B t=L/v=2s v0=5m/s A v 2 -v0 2 =2aL v=7m/s v= 1 2 5+7 m/s =6m/s A B t=L/v=1s A 7m/s B v=3m/s v0=5m/s A v0-v=at t=1s 1s I= C Wf= 36J D 2
2、. v m v W Q ( ) - 2 - A.W 0 Q mv 2B.W 0 Q 2mv 2C.W mv 2 2 Q mv 2D.W mv 2 Q 2mv 2 B 1. ( ) A. B. C. D. C A B x1 d Q Ffd Ffx1 C D 4. 37 m=1 kg g=10 m/s 2 sin37 =0.6 cos37 = 0.8 - 3 - A. 0 8 s 12m B. =0.8 C. 0 8 s 84J D. 0 8 s Q=42J C 5. A B C D ACD A - 4 - B C D 6. m1 m2 v A B C m2gv D m1+m2 gv AC 7. A h 5 m A 0.2 B P B P OP x 2 m v 5 m/s g 10 m/s 2 . A 32 25- 5 - B 24 25C P D P A
