A bullet of mass m = 10 gram strikes a ballistic pendulum of mass m=2.0 kg. the center of mass of the pendulum rises a vertical distance of h=12 cm. assuming the bullet remains embedded in the pendulum, calculate its initial speed.

Assumption made: No energy is loss!

The g is 10N/kg

Total mass = 0.01kg+2kg = 2.01kg

Gravitational Potential Energy = 2.01kg * 0.12m * 10N/kg = 2.412J

Kinetic energy = 2.412J since no energy is lost

Velocity = ((2.412J * 2) / 2.01kg) ^0.5 = 1.55m/s