- #1

Soniteflash

- 36

- 1

## Homework Statement

Two pucks are moving on a frictionless air table are about to collide. The 1.5 kg puck is moving directly east at 2.0 m/s. The 4.0 Kg puck is moving directly north at 1.0m/s.

What is the total kinetic energy of the two-puck system before the collision?

A. Square root of 13 J

B.5.0J

C.7.0 J

D.10J

E.11J

What is the magnitude of the total momentum of the two-puck system after the collision?

A. 1.0 kg*m/s

B. 3.5 kg*m/s

C. 5.0 kg*m/s

D. 7.0 kg*m/s

E. kg*m/s

## Homework Equations

(1/2)Mv

^{2}

P = mv

## The Attempt at a Solution

F[/B]or the first question I calculated the kinetic energy of the two pucks and then used the Pythagorean Theorem since the two of them are at right angles which gave me 5 Joules.

For the second question I used the Momentum formula for both pucks. I used the Pythagorean Theorem again and got 5 kg*m/s. I am unsure about this though.