This means that
→
v
=
Δ
x
Δ
t
. We can manipulate t
→
v
⋅
Δ
t
Before we put our values into the equation, we will convert the speed to
m
s
55
k
m
h
r
⋅
1000
m
1
k
m
⋅
1
h
r
3600
s
=
15.28
m
s
Now we can calculate
Δ
x
:
Δ
x
=
(
15.28
m
s
)
⋅
(
0.75
s
)
=
11.46
m
∴
You will have moved
11.46
m
before you begin to slow down.
You could also start with the kinematic equation
Δ
x
=
→
v
i
Δ
t
+
1
2
→
a
Δ
t
2
, where
→
a
=
0
. This gives
Δ
x
=
→
v
i
Δ
t
