When your teacher drops a 1.5kg book from rest, it speeds up as it falls down suppose that book hits the ground at a speed of 5m/s what hight was it dropped from

The height in which the book is dropped from is 1.28 m.

Explanation:

Mass of the book, m = 1.5 kg

initial velocity of the book, u = 0

final velocity of the bok, v = 5 m/s

The height in which the book is dropped from is given by;

v² = u² + 2gh

v² = 0 + 2gh

v² = 2gh

h = v² / 2g

h = (5)² / (2 x 9.8)

h = 1.28 m

Therefore, the height in which the book is dropped from is 1.28 m.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

+15-35=-20

going in opposite directions