Answer:

58.8 j

Explanation:

PE = mgh

PE = 2 kg x 9.8 m/s2 x 3 m

PE = 19.6 kg. m/s2 x 3 m

PE = 58 kg. m2/s2

(since 1 kg.m2/s2 = 1 joule

PE= 58.8 joules

The potential energy of an object is given by

where:

PE = potential energy

m = mass

g = acceleration due to gravity = 9.8 m/s²

h = height

Solving for the potential energy

PE = mgh

PE = (2 kg)(9.8 m/s²)(3 m)

Therefore, the potential energy of the book is 58.8 J.