Question

20g bullet fired from a gun at 125m/s how much kinetic energy

Answer 1

156.25 J

Step-by-step explanation:

If we want to calculate the kinetic energy, we have this equation:

KE = 1/2*m*v^2

So here we will get:

1/2 * 0.020 * 125^2

= 156.25 J

Answer 2

Given:

The mass of the bullet is,

`\begin{gathered} m=20\text{ g} \\ =0.020\text{ kg} \end{gathered}`

The speed of the bullet is,

`v=125\text{ m/s}`

To find:

The kinetic energy

Explanation:

The kinetic energy of the bullet is,

`\begin{gathered} KE=(1)/(2)mv^2 \\ =(1)/(2)*0.020*125*125 \\ =156.25\text{ J} \end{gathered}`

Hence, the kinetic energy of the bullet is 156.25 J.