Elastic Collision (1D) — Practice Quiz

Question 1

Two equal masses, one at rest. After head-on elastic collision:

Accepted Answer

First stops; second moves with v₁

Answer

Both have v₁/2

Answer

Both stop

Answer

Both bounce back

Question 2

A 2 kg ball at 10 m/s hits a stationary 1 kg ball elastically. Velocities after:

Accepted Answer

v₁ = 10/3, v₂ = 40/3

Answer

v₁ = 10, v₂ = 0

Answer

v₁ = 0, v₂ = 10

Answer

v₁ = 5, v₂ = 15

Question 3

Elastic collision conserves:

Accepted Answer

Both momentum and KE

Answer

Only momentum

Answer

Only KE

Answer

Only total energy

Question 4

Heavy mass hitting a stationary light mass elastically:

Accepted Answer

Light mass shoots off at 2u_heavy

Answer

Both stop

Answer

Light mass barely moves

Answer

Heavy mass reverses

Question 5

Newton's cradle (5 balls, one swung) demonstrates:

Accepted Answer

Elastic collision and velocity exchange between equal masses

Answer

Inelastic collision

Answer

Friction

Answer

Air drag