Question

A bullet having the mass of 110g is fired. If it's velocity is 50m/s, calculate the kinetic energy​

Answer 1

Answer: 137.5 Joules

Step-by-step explanation:

The SI units for kinetic energy is Joules, the SI units for mass is kilograms, and the SI units for velocity is meters per second. We are given the mass in grams, so we must convert it to kilograms. There are 1,000 grams in 1 kilogram:

`110g*(1kg)/(1000g) =0.11kg`

Kinetic energy is the energy the system has due to its motion. It is defined to be:

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

Plug everything in:

`KE=(1)/(2) (0.11kg)(50m/s)^2`

`KE=137.5J`

Answer 2

`\text{Kinetic energy,}\\\\E_k = \frac 12 mv^2\\\\~~~~~=\frac 12 \cdot 110 * 10^(-3) \cdot 50^2\\\\~~~~~=137.5~ \text{J}`