Particle of mass moves with speed along the positive -axis and collides elastically…

PHYSICS · Subjective · AP · Physics C: Mechanics · Linear Momentum · Linear Momentum

Problem

Particle

P

of mass

m

moves with speed

v

along the positive

x

-axis and collides elastically with a stationary particle

Q

of mass

2m

on a frictionless horizontal surface. After the collision,

P

moves at

30^{\circ}

above the

x

-axis. Determine the angle below the

x

-axis at which

Q

moves immediately after the collision.