Answered

What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?

A12,000 J
B6,000 J
C2,940 J
D5,880 J

Verified Answer :

AL2006


This one is a piece 'o cake if you know the formula for
Kinetic Energy, and impossible if you don't.

It is:                             KE  =  (1/2) (mass) (speed²) .

For this object:           KE  =  (1/2) (30 kg) (20 m/s)²

                                         =  (1/2) (30 kg) (400 m²/s²)

                                         =  (15 x 400) (kg-m²/s²)

                                         =     6,000 joules . 

Answer: B. 6,000 J

Explanation: 100% correct just took the pf test.

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