A body of mass $m$, travelling with velocity $v$, collides with another body of the same mass that is at rest and then remains attached to it. Which row shows the momentum and kinetic energy of the two bodies after the collision?
- Amomentum $mv$, kinetic energy $\frac{1}{4}mv^2$
- Bmomentum $mv$, kinetic energy $\frac{1}{8}mv^2$
- Cmomentum $2mv$, kinetic energy $\frac{1}{2}mv^2$
- Dmomentum $2mv$, kinetic energy $mv^2$