Question 8 of 16 A book with a mass of 1.8 kg sits on a bookshelf. If it has a gravitational
potential energy of 42 J, how high is the shelf? The acceleration of gravity is
9.8 m/s2
A. 2.1 m
B. 0.9 m
C. 1.6 m
D. 2.4 m
SUBMIT

Explanation:

PE = mgh where m is the mass, g is gravity, and h is the height from which the object can potentially fall. We are given enough info here to solve for h. Filling in:

42 = 1.8(9.8)h and

and rounding to 2 sig fig's as we need:

h = 2.4 m, choice D

i believe the answer is a hope it and is correct

there are no components of a physical goal mentioned on the list of choices that you've provided.