Question

Imagine a 15kg block moving with a speed of 20m/s. Calculate the kinetic energy of this block.

Answer 1

The kinetic energy formula is;

• $KE=\frac{m.v^2}{2}$

The variable $m$ represents the mass. Its unit is kilogram. We are informed that the mass of the object is $15kg$. The variable $v$ represents the linear velocity. Its unit is meter per second. We are informed that the linear velocity of the object is $20m/s$. Let's find the kinetic energy of the object by substituting these values in the formula.

• $KE=\frac{15kg.(20m/s)^2}{2}$
• $2.KE=15kg.400m^2/s^2$
• $2.KE=(6000)kgm^2/s^2$
• $KE=(3000)kgm^2/s^2=3000J$