Question

A 0.772 kg glass jar falls off a shelf

and reaches the ground with 11.2 J
of KE. How high was the shelf?
(Unit = m)

Answer 1

1.48m

Step-by-step explanation:

Info given:

mass: 0.772kg

PE = 11.2J

g = 9.81m/s^2

Using KEbottom = PEtop

PE = mgh

Plug in and solve for h (height)

11.2J = mgh

h =11.2J / mg

h = 11.2J / (0.772kg)(9.81m/s^2)

h = 1.48m