a train 100m long is to cross a river bridge of length 800m. what time it take to cross the bridge ?velocity of train is 36km/h.
Convert speed to m/s:
36 km/h = 36/3.6=10 m/s
In calculating train crossing bridges, we have to remember that after the head of the train has crossed the bridge (800 m), the remainder of the train is still on the bridge. So to completely cross the bridge, the time is what is takes to travel 800+100 metres.
Time required
= (800+100)m /10 m/s
= 90 s
The answer is given directly it should be in process like step by step
To calculate the time it takes for the train to cross the bridge, we first need to calculate the relative speed of the train with respect to the bridge.
The velocity of the train is given as 36 km/h. However, it's more convenient to work with meters per second, so let's convert it.
1 kilometer = 1000 meters
36 km/h * (1000 m/ 1 km) * (1 h/ 3600 s) = 10 m/s
Now, to calculate the relative speed of the train with respect to the bridge, we subtract the speed of the bridge from the speed of the train.
Relative speed = Speed of train - Speed of bridge
Since the bridge is stationary, the speed of the bridge is 0 m/s.
Relative speed = 10 m/s - 0 m/s = 10 m/s
Now, to calculate the time it takes for the train to cross the bridge, we divide the total distance (length of train + length of bridge) by the relative speed.
Total distance = 100 m (length of train) + 800 m (length of bridge) = 900 m
Time = Distance / Speed
Time = 900 m / 10 m/s = 90 seconds
Therefore, it takes 90 seconds for the train to cross the bridge.
Pagal hai kya
1. A train pusses over a 200 M long bridge in 10 sec. The length of the train is 100m. The speed of the train is.? Ans.bridge length = 200m. Train - 100m time - 10 sec - none
300m
- 300/10=30 M/s
Answer...30 M/s