A particle of mass m is moving with speed u in a direction which makes 60° with respect to x-axis. It undergoes elastic collision with the wall. What is the change in momentum in x and y direction?
A. ∆px = – mu, ∆py = 0
B. ∆px = – 2mu, ∆py = 0
C. ∆px = 0, ∆py = mu
D. ∆px = mu, ∆py = 0
Answer:A
A particle of mass m is moving with speed u in a direction which makes 60° with respect to x-axis. It undergoes elastic collision with the wall. What is the change in momentum in x and y direction?
A. ∆px = – mu, ∆py = 0 B. ∆px = – 2mu, ∆py = 0 C. ∆px = 0, ∆py = mu D. ∆px = mu, ∆py = 0