Answer:
0.225 KJ kinetic energy is used for a person of mass 50 Kg running at speed of 3 m/s.
Explanation:
Given:
mass = 50 kg
velocity = v = 3 m/s
To Find :
Kinetic energy = ?
Solution:
Kinetic energy of an object is the energy that it possesses due to its motion.
The formula for kinetic energy is given as
[tex]\textrm{kinetic energy} = \frac{1}{2}\times mass\times velocity^{2}\\= \frac{1}{2}\times m\times v^{2}\\= \frac{1}{2}\times 50\times 3^{2}\\= 25\times 9\\= 225\ Joules.[/tex]
But we required kinetic energy in KiloJoules i.e KJ
1 K = 1000 =[tex]10^{3}[/tex]
[tex]\textrm{kinetic energy} = 225\ J\\= 0.225\times 1000\\= 0.225 \times 10^{3}\\= 0.225\ KJ[/tex]
