Question

A train 200 m long crosses a bridge 300 metre long it under the bridge with a speed of 30 metre per second and the leaves it with a speed of 50 metre per second what is the time taken to cross the bridge

Answer 1

Answer:

Explanation:

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.

Answer 2

Answer:

< 75 SECONDS >

Explanation:

Train = 200m

Bridge = 300m

300 - 200 = 100m

30 + 50 = 80

80 ÷ 2 = 40

300 ÷ 4 = <75 SECONDS>

I beleive that this is correct.