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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
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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

User Emcconville
by
8.2k points

2 Answers

3 votes

Answer: B. 6,000 J

Explanation: 100% correct just took the pf test.

User Przno
by
8.4k points
4 votes

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 .
User Aleksej Vasinov
by
8.5k points
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