Exercise Problems - I — task. Science State Board, Class 9.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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1. A ball is gently dropped from a height of 20 \(m\). If its velocity increases uniformly at the rate of 10

m s^{- 2}

, with

a. What velocity will it strike the ground?

b. After what time will it strike the ground?

Solution:

From the data given,

Acceleration (\(a\)) \(=\) 10 \(\)

m s^{- 2}

Distance travelled by the ball (\(s\)) \(=\) 20 \(m\)

Initial velocity of the boat (\(u\)) \(=\) \(0\) \(m\)\(/\)\(s\) (Since it's start from the rest state)

From the Equation of motion - III, We know that,

i^{i} = i^{i} + i i i

Substituting the given values of \(u\), \(a\) and \(s\) in the above equation, we get

Velocity \(=\)

m s^{- 1}

From the Equation of motion - I, We know that,

i = i + i i

Substituting the known values in the above equation, we get

Time \(=\) \(s\)

Did you find an error?

13. Exercise Problems - I