Two identical smooth spheres undergo a perfectly elastic head-on collision on a…

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Linear Momentum · Linear Momentum

Problem

Two identical smooth spheres undergo a perfectly elastic head-on collision on a frictionless horizontal track. Initially, sphere P moves with speed

u

towards stationary sphere Q. What is the speed of sphere P just after the collision? (a)

2u

(b)

\dfrac{u}{2}

(c)

0

(d)

u