Question

The velocity of a freely falling body, starting at rest and after one second is roughly equal to ___.

• A. $10m{s}^{-1}$
• B. $15m{s}^{-1}$
• C. $100m{s}^{-1}$
• D. $98m{s}^{-1}$

Answer 1

The correct option is A $10m{s}^{-1}$

Any body in free fall is under acceleration due to gravity (g) and thus accelerates at $9.8m{s}^{-2}$. When a body starts from rest, after one second it will gain an acceleration of $9.8m{s}^{-2}$ and thus will be at a velocity of $9.8m{s}^{-1}$ in the downward direction. When rounded off to the nearest integer, the answer becomes 10.