What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?
a. 12,000 j
b. 6,000 j
c. 2,940 j
d. 5,880 j

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 . 

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