2kg (
45cm,
).
, . :
i)
.
ii)
(
).
g=10m/s2. :
, i)
1
.
2
,
, ( =0).
:
PB t
F (
2
Fx= m
)
1=0,
R
,
PB t
w :
PB t
mg
20kgm / s 2
ii)
, ,
,
,
. ,
,
:
+U 0+mg =
A
2g
+U 1 m 2
2 A
0
2 10 0,45m / s ,
3m / s :
1
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