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6.3 Quiz (B)
This test/quiz is accepting submissions until Friday, January 29, 2021 at 3:00 pm
Questions 1
Question 1 (1 point)
A roller coaster with a mass of 700 kg has 9000 J of kinetic energy. How fast is going (what is its velocity)?
a
12.85 m/s
b
6.4 m/s
С
5.1 m/s

Respuesta :

Answer:

5.1 m/s

Explanation:

The equation for kinetic energy is KE=1/2m*v2

You plug 9000J into KE and divide 700 in half to plug in for 1/2m.  That gives us 9000=350*v2.  You divide on both sides by 350, leaving us with 25 with a remainder=v2.  The square root of 25 is 5.  5.1.

my exact test question and unit haha

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