PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A shell is initially at rest in deep space. It suddenly explodes into several pieces. Which of the following statements is always true immediately after the explosion?
(a) The total kinetic energy of the fragments is zero.
(b) The vector sum of the momenta of all fragments is zero.
(c) Each fragment has the same magnitude of momentum.
(d) The vector sum of the velocities of all fragments is zero.