Question

How much kinetic energy does a person of mass 50kg running at 3m/s have? Provide

your answer In KJ.

Answer 1

0.225 KJ kinetic energy is used for a person of mass 50 Kg running at speed of 3 m/s.

Step-by-step 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

`\textrm{kinetic energy} = (1)/(2)* mass* velocity^(2)\\= (1)/(2)* m* v^(2)\\= (1)/(2)* 50* 3^(2)\\= 25* 9\\= 225\ Joules.`

But we required kinetic energy in KiloJoules i.e KJ

1 K = 1000 =
`10^(3)`

`\textrm{kinetic energy} = 225\ J\\= 0.225* 1000\\= 0.225 * 10^(3)\\= 0.225\ KJ`