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A body is thrown up with a velocity of $20 m / s$ . Which of the following is the maximum height attained by it?

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80

60 m

40 m

20 m

answer is D.

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Detailed Solution

A body is thrown up with a velocity of

20 m / s

. Then the maximum height attained by it is

20 m .

Given, Initial velocity,

u = 20 m / s

and at maximum height (body at rest)
Final velocity,

v = 0 m / s

Since,

v^{2} - u^{2} =

2 gh

Where

g

represents acceleration due to gravity,

g = 10 m / s

(approx.) Therefore, for height

h

, put all the values in above equation, we get

0 - 400 = 2 \times (10) \times h

\Rightarrow h = 20 m

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