What is the gravitational potential energy of a book with a mass of 0.3 kg on a 1.0 high desk? 3.0 j 30j 0.3j

The gravitational potential energy of a book with a mass of 0.3 kg on a 1.0 m high desk is 3.0 J (First option)  

Solution:

Mass of the book: m=0.3 kg

Height: h=1.0 m

Gravity's acceleration: g=10 m/s^2

Gravitational potential Energy: Ep=?

Ep=m g h

Replacing the given values:

Ep=(0.3 kg) (10 m/s^2) (1.0 m)

Ep = 3 (kg m/s^2) m

Ep = 3 N m

Ep = 3 Joules

Ep = 3 J

mistakes are ok

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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