Uh I think it is inertia but I could be wrong
6.3 That Would be the I answer I think but Check on Google For the formula
The sad ball does not rebound after it strikes the block. This means that the collision is inelastic. If two sad balls collide with each other, we can assume completely inelastic collision. Since momentum is conserved, the kinetic energy during the collision would be twice that of each of the ball's, half of the kinetic energy of each ball will be dissipated.
The answer is B !!!!!!!!! It’s B electrical