Question

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

Answer 1

Answer: B. 6,000 J

Explanation: 100% correct just took the pf test.

Answer 2

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 .