Question

A hockey puck is pushed by a stick with a force of 750 newtons. The puck travels 2.0 meters in 0.30 seconds. How powerful is the push? (Ignore frictional effects.)

Answer 1

The work done by the stick on the hockey puck is equal to the magnitude of the force times the distance covered by the puck:
$W=Fd=(750 N)(2.0 m)=1500 J$

And the power of the stick is equal to the ratio between the work done and the time taken, therefore
$P= \frac{W}{t}= \frac{1500 J}{0.30 s}=5000 W$