A
)
m,
v1
the
=
=
Mz
=
V2
=
at
moving
150kg
mass
cases
a
velocity
calculate
,
30m51
of
the
velocity
:
stationary
is
car
of
car
following
the
in
car
100kg
mass
another
with
i
of
car
100
y,
?
=
112=2
30
.
150
0
momentum
total
Miu
before
=
Mz V2
=
t
,
100130 )
150 ( O )
+
+
(
45000
1011 ,
30
=
③
sub
-
EM
90th
-
24th
-
V2
,
5042
+
75
V22
-
( V2 -24 )
=
0
=
0
=
0
112=0
sub
V2
30
=
=
-
,
=
into
-24
'
-
(
rejected )
③
1.5124 )
6m51
,
V2
"
=
+75 V2
112.542+75 V2
+
6
-
V2
+2.251122 )
112--24
V
kinetic energy
v12 + tzmzv }
②
4500lb
-
V5
°
-①
1-21100711,2+1-2115071122
=
=
45000-4500 V2
=
187.5 V22
• .
15112
-30
1.5112
50 ( 900
=
45000
,
150×2
total
=
50130-1.5 V25 +75
=
45000
11
+
150 V2
15112
+
into
45000
11 ,
+
24ms
after
M2 V2
①
=
Yi
1011 ,
=
¥ Miu ? tzmz V22
¥1100) 30ft 0
+
10011 ,
=
total kinetic energy before
+
IOOV ,
=
300
300
M , V,
=
3000
from
total momentum
②
after
collides
of each
ii )
the
M,
U
,
v.
=
=
=
moving towards
is
car
100
Mz
v2
?
V2
total
before
Mzvz
+
100130 )
150120)
+
6000
60
KE before
{Miu ?
+
£ M2 V22
501305+751205
75000
1500
60
111
V1
=
60
=
sub
1500
1500
=
total
=
Miv ,
=
IOOV ,
V1
=
tzmiv?
=
50 vi.
=
+
V12
+
( 60
l 5 V2 )
-
>
-
1.5 V22
+
3600-180 V2 +2.25 V22 +1.542
=
3.75 V22
180 V2 +2100=0
-
1122--482+560=0
( V2 -24 ) ( vz-201=0
112=20
112--24
sub
when
V2
V1
V1
when
of
values
v2
=
Vi
=
V1
=
-_
=
=
20
60
30
60
ms
-
-
into
-1
1.5 ( 20 )
ms
ms
24
v2
-
-
'
'
1.5124 )
24m51
1.5 V2
①
-
+
I M2Vz2
75
V22
1.542--20
③ into ②
=
150 V2
5042+75 V22
=
-30
5Vz
1.
-
150 V2
+
+
M 2112
KE after
=
=
+
momentum
+
1004
=
1.5 V2
+
velocity of
0
=
Milli
①
a
20
=
momentum
from
at
car
150
=
30
first
the
③
after
20ms
"
iii
)
the
the
in
M
U
=
,
Mz
=
30
V2
=
v=
?
both
i.
forward
boy
Mi
u
=
=
,
v.
after
=
50
M2
=
0
V2
=
?
v2
stone
the
in
with
=
before
momentum
+
+
5 ( IO )
KE before
0
+
+
¥ (5) ( 1012
100
too
10
10h2
=
V12
+
b- V12
11 ,
V12
②
+
(
+
2h
,
=
-
V.
0
=
=
-
§
=
50hr ,
+
504
t
IOV ,
=
=
=
=
=
10
=
5 V2
5. V2
V2
+
10th
-
-
①
KE after
tgm.ir?+tgM2Vz2
£ ( 50742+1-2 (5) V22
2542
10h
'
+
+
fv22
10h12
V22
-20
v.
V2
V2
0
V2
-
=
Is
10
=
=
i.
V
+2¥
14
0.4ms
-
,
=
-
"
vz
:
14ms
①
105} )
-
10
=
into
0
C rejected)
after
M 2112
+
sub
(54+2)=0
v,
Miv ,
momentum
too -50hr , -10042
+
40W
10
=
£ M2 V22
250
into
=
=
V2
↳Miu ?
total
=
10
10
boat
the
.
=
M2 V2
50
=
mass
?
500 )
100
of
velocity
a
thrown
is
boat of
stationary
a
10
Milli
①
'
5
total
sub
velocity
have
24ms
stone
5kg
a
250 )
24m51
=
'
standing
50kg
mass
Mi + Mz )
(
(
v
=
cars
of
of
v
=
3000
t
momentum after
total
=
M2 V2
+
,
y
the
car
20
3000
throws
"
150
Miu
boy
20ms
first
the
as
total momentum before
A
of
velocity
a
direction
same
100
=
,
with
moving
is
car
l
"
100kg
and