Question

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

Answer 1

$\text{Kinetic energy,}\\\\E_k = \dfrac 12 mv^2\\\\~~~~~=\dfrac 12 \cdot 110 \times 10^{-3} \cdot 50^2\\\\~~~~~=137.5~ \text{J}$

Answer 2

Answer: 137.5 Joules

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:

$110g*\frac{1kg}{1000g} =0.11kg$

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

$KE=\frac{1}{2} mv^2$

Plug everything in:

$KE=\frac{1}{2} (0.11kg)(50m/s)^2$

$KE=137.5J$