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Matter In Our Surroundings

Question
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A train is travelling at a speed of 90 km/h. The brakes are applied so as to produce a uniform acceleration of - 0.5 m/s2. Find how far the train goes before it stops?

Solution
Here comma space I n i t i a l space v e l o c i t y space o f space t r a i n comma space straight u space equals space 90 space km divided by straight h space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 90 space cross times space 1000 space straight m over denominator 3600 space straight s end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 25 space straight m divided by straight s Acceleration comma space straight a space equals space minus 0.5 space straight m divided by straight s squared Final space velocity comma space straight v space equals space 0 U sin g space e q u a t i o n space o f space m o t i o n comma space space straight v squared space minus space straight u squared space equals space 2 as comma space w e space h a v e space space space 0 squared space minus space 25 squared space equals space 2 space cross times space left parenthesis negative 0.5 space right parenthesis straight s space space space space space space straight s space equals space fraction numerator 625 over denominator 2 space cross times 0.5 end fraction space equals 625 space straight m
Therefore, distance travelled by the train before it stops = 625 m

Some More Questions From Matter In Our Surroundings Chapter

What is the physical state of water at

a) 25°C
b)00C
c)1000C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

What produces more severe burns, boiling water or steam ?

8. Name A, B, C, D, E and F in the following diagram showing state change :

Both boiling and evaporation convert a liquid into vapour. What is the difference between the two process

Define Evaporation

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