Question

A particle of mass m is moving with speed u in a direction which makes 60° with respect to the x-axis. It undergoes elastic collision with the wall. What is the change in momentum in x and y direction?

Options

• ∆p_x = −mu, ∆p_y = 0

• ∆p_x = – 2mu, ∆p_y = 0

• ∆p_x = 0, ∆p_y = mu

• ∆p_x = mu, ∆p_y = 0

Answer 1

∆p_x = −mu, ∆p_y = 0