Verified answer

Answer:

To calculate the kinetic energy use the formula KE= 1/2 mv². Kinetic energy refers to the energy that the object possessed due to their motion.

Given:

Mass (m) = 40kg

Velocity = 15m/s

KE = ?

Solution:

KE = (1/2) 40 x (15)²

KE = (1/2) 40 x 225

KE = (1/2) 9000

KE = 9000/2

KE = 4500 J

The SI unit for work or energy is Joule (J). Therefore, the total kinetic energy of the girl is 4500 J.

Question:

• A girl on a motorbike passes by at a speed of 15m/sec.Her mass is 40 kg.what is her energy?

Answer:

KE = ½ mv²

KE = ½ × 40 kg × (15 m/s)²

KE = 4500 J