Question

A cellphone weighing 80 g is flying to the air at 15 m/s what is it's kinetic energy​

Answer 1

Answer:

9J

Explanation:

Given parameters:

Mass of cell phone  = 80g

          1000g  = 1kg

            80g is therefore 0.08kg

Velocity of the cellphone  = 15m/s

Unknown:

Kinetic energy of the cellphone  = ?

Solution:

The kinetic energy of a body is the energy due to its motion.    

 It is expressed as:

    K.E  = $\frac{1}{2}$ mv²   =  $\frac{1}{2}$  x 0.08 x 15²   = 9J