Physics
An object falling freely from rest reaches ground in 2 s. If acceleration due to gravity is 9.8 m s-2 , the velocity of the object on reaching the ground will be —
- 9.8 m s-1
- 4.9 m s-1
- 19.6 m s-1
- Zero
Laws of Motion
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Answer
19.6 m s-1
Reason — As we know,
Velocity of the object = g x t
Given,
u = 0,
g = 9.8 m s-2
t = 2 s
v = u + gt
Substituting the values in the formula above, we get,
Velocity of the object = 0 + 9.8 x 2 = 19.6 m s-1
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