A hockey puck of mass 250g is struck so that it slides over ice with speed 18ms−1. Answer the following:
a. (a) Convert the mass of the puck into SI units.
b. (b) Calculate the magnitude of its linear momentum.
c. (c) A safety device on the rink boards is designed to activate only if the magnitude of the puck’s momentum exceeds 5kgms−1. Will the device activate when this puck hits the boards? Give a reason for your answer.