Respuesta :

Answer:

Force on the object is 20 N

Explanation:

As we know that work done to raise the book from initial position to final position is known as potential energy stored in it

So here we know that

[tex]U = F.s[/tex]

here we know that

U = 30 J

s = displacement = 1.5 m

so we have

[tex]30 = F(1.5)[/tex]

[tex]F = 20 N[/tex]