Physics

Problem

Which one of the following expressions gives the distance

s_n

travelled by a body during the

n^{\text{th}}

second of free fall if its initial velocity downward is

u

and the acceleration due to gravity is

g

? a)

s_n = u + g n

s_n = u n + \dfrac{1}{2} g n^{2}

s_n = u + \dfrac{g}{2}(2n-1)

s_n = u + g(n-1)