Question

The spring of a dart gun exerts a force on a 0.02 kg dart as it is launched from the gun with 4.00 J of KE. At what velocity does the dart come out of the gun?

Answer 1

Let's see

• KE=1/2mv²

m is mass and v is velocity

• 2KE=mv²
• 4(2)=0.02v²
• 8=2v²/100
• 2v²=800
• v²=400
• v=20m/s