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An object falling freely from rest reaches the ground in 2 seconds. If acceleration due to gravity is 9.8 m/s², the body will hit the ground with a velocity of?

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9.8 m/s

19.6 m/s

4.9 m/s

26.5 m/s

answer is B.

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Detailed Solution

Initial velocity, u = 0 m/s, time, t = 2 s, acceleration due to gravity, g = 9.8 m/s²

The final velocity of the body, v = u + gt
= 0 + (9.8 x 2)
= 19.6 m/s

The body will hit the ground with a velocity of 19.6 m/s .

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