Question

A 1.5kg book on top a shelf has a P.E of 29.4 J. How high is the shelf?
Please answer this question quickly otherwise i will not be able to complete and submit my assignment PLEASE PLEASE!!!!

Answer 1

Answer:

2

Explanation:

mgh = P.E of the system

m = 1.5 and g=9.8 and P.E.=29.4

Equating the above equation,

we get, 1.5×9.8×h=29.4

therefore finding h which is the height of the shelf.

is, h = 29.4/1.5×9.8 = 2m

Answer 2

Answer:

it's easy

Explanation:

P.E=mgh

P.E = 29.4J

m= 1.5 kg

g= 9.8 m/s2

h=?

P.E/m×g = h

29.4J ÷ 1.5kg × 9.8m/s2= 2m