A ball is dropped from rest from a high cliff at the same instant a second

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

Problem

A ball is dropped from rest from a

20\,\text{m}

high cliff at the same instant a second, identical ball is launched horizontally from the same height with a speed of

10\,\text{m}\,\text{s}^{-1}

. Ignore air resistance. What is the ratio of the speed of the launched ball to the speed of the dropped ball at the instant they hit the ground? (a)

1.4

(b)

1.1

(c)

1.0

(d)

2.0