Linear Momentum

Which of the following scenarios best represents an elastic collision?

In an elastic collision, what is conserved?

A 2 kg ball moving at 5 m/s collides elastically with a stationary 1 kg ball. After the collision, the 2 kg ball moves at 1 m/s in the same direction. What is the velocity of the 1 kg ball after the collision?

Two objects with masses $m_1$ and $m_2$ and initial velocities $v_{1i}$ and $v_{2i}$ respectively, undergo an elastic collision. Which equations must be solved simultaneously to find the final velocities $v_{1f}$ and $v_{2f}$?

A 5 kg object moving at 3 m/s to the right collides elastically with a 2 kg object moving at 2 m/s to the left. After the collision, what are the velocities of the two objects?

A ball is dropped from a height $h$ onto a hard floor and bounces elastically. After the first bounce, it reaches the same height $h$. If the collision were followed by projectile motion where the ball is launched horizontally, what additional information is needed to determine the range of the projectile?

In an inelastic collision, what happens to the kinetic energy that is lost?

A 3 kg object moving at 4 m/s collides inelastically with a stationary 1 kg object. After the collision, the 3 kg object is moving at 2 m/s in the same direction. How much kinetic energy is lost during the collision?

A ball with an initial velocity of $v$ is dropped onto a surface. After the bounce, its velocity is $0.8v$ in the opposite direction. What is the coefficient of restitution for this collision?

In a perfectly inelastic collision, what is true of the objects after the collision?