Question

A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of

• A. $3s$
• B. $5s$
• C. $7s$
• D. $9s$

Answer 1

Answer: (B)

$5s$

Answer 2

$\frac{1}{2}g(3)^{2} = \frac{g}{2}(2n - 1) \Rightarrow n = 5\mspace{6mu} s$