You are playing ice hockey with friends on a frozen pond. The hockey puck (mass 0.2 kg) is sliding on the ice at 10 m/s when it starts to hail. A hailstone lands on the puck, causing it to slow to 8 m/s. What mass does the hailstone have

The mass of the hailstone is  

Explanation:

From the question we are told that

    The mass of the hockey puck is

     The initial speed of the puck is

      The final speed of the puck is  

According to the principles of linear momentum

At initial the velocity of the hailstone was zero so

So  

substituting values

=>    

=>    

=>    

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop