Calculate the kinetic energy of a 45 gram golf ball traveling at 20 m/s

Kinetic energy = (1/2) (mass) x (speed)²  .

KE  =  (1/2) (0.045 kg) x (20 m/s)²

KE = (0.0225 kg) x (400 m²/s²)

KE = (0.0225 x 400) (kg-m²/s²)

KE = 9 (kg-m/s²) (m)

KE = 9 Joules

The kinetic energy of a 45 gram golf ball traveling at 20 m/s is 9 Joules .

Explanation:

Given:

Mass of the golf ball= 45 gram

velocity at which the golf ball travels=20m/s

To Find:

Kinetic energy=?

Solution:

We define kinetic energy as the energy gained by a body by virtue of its motion or from its state of rest to its motion.It’s unit is Joules.

Mass= 45 grams

Converting into kg  

1000 grams = 1 kilogram.

45grams= 0.045kg

Also velocity given as 20 m/s

Hence substituting the values

Kinetic Energy=

Kinetic Energy=9 Joules .

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jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.