Collision Conservation of Momentum · PhysicsBowl 2014 #15

Physics · mechanics

Problem

Two objects, A and B, move in space and then collide. Before collision: Object A, of mass

5.0

kg

, moves to the right with a speed of

25.0

\frac{m}{s}

. Object B, of mass

10.0

kg

, moves to the left with a speed of

20.0

\frac{m}{s}

. After collision: Object A moves to the left with a speed of

25.0

\frac{m}{s}

. What is the velocity of object B after the collision? (A)

30.0

\frac{m}{s}

to the right (D)

5.0

\frac{m}{s}

to the right (B)

20.0

\frac{m}{s}

to the right (E)

5.0

\frac{m}{s}

to the left (C)

20.0

\frac{m}{s}

to the left