Question

a 7 kilogram cat is resting on top of a bookshelf that is 2 meters high. what is the cat’s gravitational potential energy relative to the floor? joules

Answer 1

Answer:

The cat’s gravitational potential energy relative to the floor is 137.2 Joules.

Explanation:

Given that,

Mass of cat = 7 kg

Height of bookshelf = 2 m

The gravitational potential energy :

The gravitational potential energy is the product of the mass of the object, gravity and height of the object from the ground.

The gravitational potential energy relative to the floor is

$P.E = mgh-0$

$P.E = 7\times9.8\times2-0$

$P.E=137.2\ J$

Hence, The cat’s gravitational potential energy relative to the floor is 137.2 Joules.

Answer 2

PE = mgh
      Mass, m = 7kg, g ≈ 10 m/s², height = 2m     
 
      = 7*10*2
 
       = 140 Joules.