Question

A train 200 m long crosses a bridge 300 m long
It enters the bridge with a speed of 30 m/s and
leaves with a speed of 50 m/s. The time taken by
train to cross the bridge is (Assuming train is moving
with constant acceleration)
(1) 7.5 s
(2) 12.5 s
(3) 15,0 s
(4) 17.5 s​

Answer 1

Answer:

The acceleration is given as,

a=

2s

v

2

−u

2

=

2×500

(5)

2

−(3)

2

=

1000

16

m/s

2

The time taken to cross the bridge is given as,

t=

a

v−u

=

1000

16

5−3

=125s

Thus, the time taken to cross the bridge is 125s.