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What will be the initial velocity of the object if it is thrown vertically upwards to a height of $20 m .$ (take, $g = 10 m / s^{2}$ )

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15 m / s

25 m / s

10 m / s

20 m / s

answer is D.

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Detailed Solution

20 m / s

will be the initial velocity of the object if it is thrown vertically upwards to a height of

20 m

.
Given,
height,

(s) = 20 m

g = 10 m / s^{2}

At the top most point, final velocity will be,

= 0

,
From the equation,

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

Where

v =

final velocity

u =

initial velocity

g =

acceleration due to gravity

h =

height
⇒

0

u^{2} - 2 \times 10 \times 20

Initial velocity,

u = 20 m / s

Thus, the object was thrown upward with velocity

20 m / s

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