Which one of the following expressions gives the distance travelled by a body during…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

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

(b)

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

(c)

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

(d)

s_n = u + g(n-1)

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