Physics, asked by pandyahet2005, 9 months ago

The driver of train A travelling at a speed of 54 km/h applies brakes and retards the train uniformly. The train stops
in 5 s. Another train B is travelling on the parallel with a speed of 36 km/h. Its driver applies the brakes and the train
retards uniformly and stops in 10 s. Plot speed-time graphs for both the trains on the same axis. Which of the trains
travelled farther after the brakes were applied?

Answers

Answered by amitnrw
30

Given : The driver of train A travelling at a speed of 54 km/h  applies brakes and retards the train uniformly. The train stops in 5 seconds.

Another train B is travelling on the parallel with a speed of 36 km/h  ,  Its driver applies the brakes and the train  retards uniformly; train B stops in 10 seconds.

To Find : Plot speed-time graphs for both  the trains on the same axis.

Which of the trains travelled farther after the brakes  were applied?​

Solution:

Train A  = 54 km/h  =  54 * 5 / 18  = 15 m/s

Time = 5 sec

Distance covered  =  5 *( 15 + 0)/2  = 37.5 m

acceleration = ( 0 - 15)/5 = - 3 m/s²

Time    Speed

0            15

1              12

2            9

3            6

4           3

5            0

Train B  = 36 km/h  =  36 * 5 / 18  = 10 m/s

Time = 10  sec

Distance covered  =  10 *( 10 + 0)/2  = 50 m

a = ( 0 - 10)/10  = - 1 m/s²

Time    Speed

0            10

1              9

2            8

3            7

4            6

5            5

6           4

7           3

8           2

9           1

10          0

 trains B travelled farther after the brakes  were applied

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Attachments:
Answered by shabareevasan
13

Answer:

For train A:

5 u=54 km/h=54x. = 15 m/s 18

v=0;t=5s

For train B:

5 u=36 km/h = 36x = 10 m/s 18

v=0;t=10s

Distance travelled by A = Area under EF = 2/1×15×5=37.5m

Distance travelled by B = Area under CD = 2

1 x10x10-50 m

Explanation:

I think you understand

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