A disc of mass slides with negligible friction along a flat surface with a velocity
PHYSICS · Single correct · AP · Physics C: Mechanics · Linear Momentum · Linear Momentum
Problem
27. A disc of mass m slides with negligible friction along a flat surface with a velocity v. The disc strikes a wall head-on and bounces back in the opposite direction with a kinetic energy one- fourth of its initial kinetic energy. What is the final velocity of the disc?
(A) v/4
(B) v/2
(C) −v
(D) −v/2
(E) −v/4