## a ball with a mass of 2 grams is sitting on the edge of a building that is 20 meters tall. what is its potential energy?

Question

a ball with a mass of 2 grams is sitting on the edge of a building that is 20 meters tall. what is its potential energy?

in progress 0
2 days 2021-07-22T07:26:19+00:00 2 Answers 0 views 0

The potential energy is 0.39 Joule

Explanation:

If a body of mass m is held at a height h above the ground it

Then P. E= weight *height

P.E=mgh

Given data

Mass m=2 grams to kg – – 2/1000=

0.002kg

Height h =20m

Assuming g= 9.81m/s²

Then P.E= 0.002*9.81*20

P.E= 0.39J

Potential energy is the energy possessed by a body by virtue of its position.

Explanation:

Potential energy is given as

P.E = mgh

Where

m is the mass of the body

g is the acceleration due to gravity

h is the height at which the object is at.

In this question,

m = 2gram

m = 2 / 1000 = 0.002kg

h = 10m

g is constant = 9.8 m/s²

Then,

P.E = mgh

P.E = 0.002 ×10 × 9.8

p.E = 0.196 J

The unit of potential energy is you’re and it is a scalar quantity, I.e it has no direction but has only magnitude.