5. A train moving on a straight level track passes a pole in 5s. find a) the speed of the train b) the time it will take to cross a bridge 500 m long.
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Explanation:
a)
d=100m
t=5sec
v=?
v=d\t
=100\5
=20m\s
(b)
d=500m
t=?
v=20m\s
v=d\t
t=d\v
=500\20
=25sec
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