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Matter In Our Surroundings

Question
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A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms-2, with what velocity will it strike the ground? After what time will it strike the ground?

Solution
H e r e comma space I n i t i a l space v e l o c i t y comma space straight u space equals space 0 H e i g h t space f r o m space w h i c h space t h e space b a l l space i s space d r o p p e d comma space straight s space equals space 20 space straight m Acceleration comma space straight a space equals space 10 space m s to the power of negative 2 end exponent space V e l o c i t y space w i t h space w h i c h space t h e space b a l l space w i l l space s t r i k e space t h e space g r o u n d comma space straight v space equals ? space T i m e space t a k e n space f o r space t h e space b a l l space t o space s t r i k e space t h e space g r o u n d comma space straight t space equals ? N o w comma space u s i n g space e q u a t i o n space space space space space space space straight v squared minus straight u squared space equals space 2 a s therefore space space space straight v squared space minus space 0 squared space equals space 2 space cross times space 10 space cross times space 20 space space space space space space space space space space space space space space space space space space space space space space equals space 400 rightwards double arrow space space space space space space space space space space space space space space straight v space equals 20 space m s to the power of negative 1 end exponent T i m e space t a k e n comma space straight t space equals fraction numerator straight v minus straight u over denominator straight a 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 equals space fraction numerator 20 minus 0 over denominator 10 end fraction space equals space 2 straight s

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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