They help a secolator
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Answer:
As the escalator is stationary, so the distance covered in t
1
seconds is L which is the length of the escalator.
Speed of man w.r.t. the escalator, v
me
=
t
1
L
b.When the man is stationary, by taking man as a reference point the distance covered by escalator is L in time t
2
.
Speed of escalator, v
c
=
t
2
L
c. Speed of man w.r.t. the ground, v
m
=v
me
+v
c
_
⇒v
m
=
t
1
L
+
t
2
L
=L[
t
1
1
+
t
1
1
]= L[
t
1
t
2
t
1
+t
2
]
∴t=
v
m
L
=[
t
1
+t
2
t
1
t
2
]
which is the time taken by the man to walk up the moving escalator.
Explanation:
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