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Matter In Our Surroundings

Question
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A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s, what is the value of acceleration?

Solution
Here comma I n i t i a l space v e l c o i t y comma space straight u space equals space 0 T i m e space o f space t r a v e l comma space straight t space equals space 5 space straight s Distance space travelled comma space straight s space equals space 100 space straight m Acceleration comma space straight a space equals space ? therefore space space U sin g space t h e space s e c o n d space e q u a t i o n space o f space m o t i o n comma space space space space space space space space space space space space space space space space space space space space space space straight s space equals space ut plus 1 half at squared therefore space space space space 100 space equals space 0 plus 1 half straight a cross times 5 squared space space space space rightwards double arrow space space space space 100 space equals space 25 over 2 straight a space space space space rightwards double arrow space space space space space space space space space straight a space equals space fraction numerator 100 space cross times space 2 over denominator 25 end fraction space equals space space 8 space straight m divided by straight s squared  
Therefore, the body is accelerating at the rate of 8 m/s2. 

Some More Questions From Matter In Our Surroundings Chapter

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

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 :

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