38 : : :
,
u(m/s)
.
;
10
t=0s t=5s;
6 ,
.
; t=0s
t=6s;
0
, a. b. c. d. H a. b. c. d.
3
5
t(s)
6
t(s)
.
. . .
u(m/s)
.
10
: . . . .
5 ,
x
2 3t
2t 2 . 0
; a. b. c. d. e.
t0=0s 2m/s2. u=3+4t.
x0=0m,
t0=0s
3m/s. 2
- 4m/s .
x
x
t
t
a 1. x 4. x
3m/s.
u0t
t
b
1 2 at 2
c
d
2. u 5. x
u0t
t
3. u
1 2 at 2
6. x
3t
u0 at
u-t
. -t.
. .
u m/s
4
0s - 2s
2s - 4s.
.
t=3s. x0=0m.
t0=0s
2
=f(t)
.
2.1. . 95m
. -95m
t sec
u m/s 10
: . 70m
4
. 80m ;
2.2.
. 90m
. 80m
. 40m
. -20m
2.3.
. x= -90m
. x=100m
12 13 5
. x= -40m
t=0 . x=120m
x0=20m.
.
10
t sec
-10
. .
x ,
.
. ; x= -4 -40t +2,5t2
u= 40 -5t
=5
.
u=f(t)
. :
u m/s
>0 t sec
x
u=f(t)
. :
<0
u m/s
x t sec
=f(t)
.
2.1.
u m/s 10
: . 70m
. 75m
. -95m
. 90m
. 70m
. 75m
. -95m
. 185m
;
2.2.
t=0
2.1.
. 60m
. 15m
. -5m
. 90m
13 5
x0=-80m.
-10
10 12
16 t sec