根据运动学公式△x=at 2得:
a=
△x
t 2 =
x BC - x AB
t 2 =
(7.82-5.60)cm
(0.1s) 2 =2.2m/s 2,
利用匀变速直线运动的推论得:
v B=
x AC
2t =
(7.82+5.60)cm
0.2s =0.671 m/s.
故答案为:2.22,0.671.
根据运动学公式△x=at 2得:
a=
△x
t 2 =
x BC - x AB
t 2 =
(7.82-5.60)cm
(0.1s) 2 =2.2m/s 2,
利用匀变速直线运动的推论得:
v B=
x AC
2t =
(7.82+5.60)cm
0.2s =0.671 m/s.
故答案为:2.22,0.671.