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Standard VII
Physics
Acceleration
A driver appl...
Question
A driver applies brakes when he sees a child on the railway track, the speed of the train reduces from 54 km/h to 18 km/h in 5 s. what is the distance travelled by the train during this interval of time?
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Solution
u
=
5
18
×
54
=
15
m
/
s
v
=
5
18
×
18
=
5
m
/
s
U
sin
g
t
h
e
f
o
r
m
u
l
a
s
=
(
u
+
v
2
)
×
t
s
=
(
15
+
5
2
)
×
5
s
=
20
2
×
5
=
10
×
5
=
50
m
R
e
g
a
r
d
s
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