Question

Suppose a 2 kilogram mass is traveling at 3 meters/seconds.

Which of the following is the object's kinetic energy (KE)

a. 3 joules
b. 6 joules
c. 9 joules
d. 18 joules

KE = 1/2mv² (m= mass, v= velocity, KE is expressed in joules)
KE =1/2 (2kg) x (3m/sec)² = ? joules

Answer 1

The kinetic energy of a 2kg mass moving at 3m/s is calculated using the formula KE = 1/2mv². Plugging the values into the formula gives us KE = 9 joules, so the correct answer is (c) 9 joules.

Step-by-step explanation:

The question involves calculating the kinetic energy (KE) of an object in motion. According to the formula KE = 1/2mv², where m is the mass of the object and v is the velocity, the kinetic energy can be determined for a 2-kilogram mass traveling at 3 meters per second. Plugging the values into the formula:

KE = 1/2 × 2kg × (3m/s)² = 1kg × 9m²/s² = 9J.

Therefore, the correct answer is (c) 9 joules, which represents the kinetic energy of the mass in motion.