Mixing Units and Kinetic Energy Calculations 2

Question: If a bullet has a mass of 150 g and is shot at a muzzle velocity of 960 m / s, what is its kinetic energy?

Answer:

Step 1: Analyze the question to determine what information is provided

• We are given the mass of the bullet
  
  . This is not the unit we want mass to be in. We need to convert to kg. Again, we multiply by one:
  
• We are given muzzle velocity which is just how fast the bullet leaves the barrel and it is
  
  .

Step 2: Analyze the question to determine what is being asked

• We are asked to find the kinetic energy

Step 3: Substitute and calculate

We just substitute the mass and velocity (which are known) into the equation for E _k: