Physics

Problem

A hockey puck of mass

200\,\text{g}

slides on a frictionless horizontal ice surface. At a certain instant its velocity components are

3\,\text{m\,s}^{-1}

along the

x

–axis and

4\,\text{m\,s}^{-1}

along the

y

–axis. a. (a) Determine the magnitude of its speed at that instant. b. (b) Compute its kinetic energy in joules.