Physics, asked by rajeevjnp, 14 hours ago

A train is traveling at a speed of 90 km/h. It is required to stop at the next station, which is 0.3 km away. What retardation must its brakes provide and how much time will the train take to reach the station and stop?

Answers

Answered by vanshit5170
1

Answer:

ok

Explanation:

train is travelling at a speed of 90 km/hr. Brakes are applied so as to produce a uniform acceleration of -0.5 m/s2.

Answered by ananya2006sri
0

Answer:

Given that,

Acceleration a=−0.5m/s  

2

 

Speed v=90km/h=25m/s

Using equation of motion,  

v=u+at

Where,  

v = final velocity

u = initial velocity

a = acceleration

t = time

Put the value into the equation

Finally train will be rest so, final velocity,v=0

0=25−0.5t

25=0.5t

t=  

0.5

25

 

t=50 sec

Again, using equation of motion,  

S=ut+  

2

1

at  

2

 

Where, s = distance

v = final velocity

u = initial velocity

a = acceleration

t = time

Put the value into the equation

Where S is distance travelled before stop

s=25×50−  

2

1

×0.5×(50)  

2

 

s=625 m

So, the train will go before it is brought to rest is 625 m.

Hence, A is correct.

Explanation:

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