Question

Momentum can be conserved in two-dimensional collisions, but kinetic energy is only conserved in some one dimensional collisions.a.True b.False because kinetic energy can be conserved in 2-d collisionsc.False because momentum is only conserved when all three dimensions are includedd.False because kinetic energy can only be conserved if all three dimensions are included

Answer 1

Answer:

b.False because kinetic energy can be conserved in 2-d collisions

Explanation:

Momentum is always conserved in 2-d collisions. You have to consider each dimension.

before ∑m*Vx = ∑m*Vx after

before ∑m*Vy = ∑m*Vy after

In elastic collision kinetic energy is also conserved in in 2-d collisions.

before ∑ 1/2*m*V² = ∑ 1/2*m*V² after