An engine of a train, moving with uniform acceleration, passes the signal post with velocity u and the last compartment with velocity v. The velocity with which middle point of the train passes the signal post is:
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Answer:
(1) length of train :- l
When last compartment passes through pole distance covered by first compartment is l
∴v
2
=u
2
+2al
∴a=
2l
v
2
−u
2
Now, when middle post passes, distance covered by first compartment is
2
l
∴v
f
2
=u
2
+
2
Ral
=u
2
+(
2l
v
2
−u
2
)l=
2
v
2
+u
2
∴v
f
∴v
f
2
=u
2
+
2
Ral
=u
2
+(
2l
v
2
−u
2
)l=
2
v
2
+u
2
∴v
f
=
2
v
2
+u
2
Explanation:
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