Stone 1 is dropped from rest from a height of above the ground at the same instant…

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

Problem

Stone 1 is dropped from rest from a height of

45\,\text{m}

above the ground at the same instant that Stone 2 is dropped from rest from a height of

20\,\text{m}

above the ground. Taking

g = 10\,\text{m/s}^2

, the time interval between the moments the two stones reach the ground is (a)

2\,\text{s}

(b)

1\,\text{s}

(c)

0\,\text{s}

(d)

2.5\,\text{s}