Question

Calculate the amount of kinetic energy a 50 kg runner has when he is going 2 m/s.

Equation: KE = 1/2mv2

Answer 1

Given,

mass(m)=50kg

velocity(v)=2m/s

kinetic energy(K.E.)=?

We know that K.E.=1/2mv2

KE=1/2×50×2^2

Step-by-step explanation:

=1/2×200

=100 Joule

Answer 2

Given:

Mass of the runner (m) = 50 kg

Speed of the runner (v) = 2 m/s

Equation:

`\rm KE = (1)/(2) mv^2`

Answer:

By substituting values in the equation, we get:

`\rm KE = (1)/(2) * 50 * 2^2 \\ \\ \rm = (1)/(2) * 50 * 4 \\ \\ \rm = 25 * 4 \\ \\ \rm = 100 \: J`

`\therefore` Kinetic energy of the runner = 100 J