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?
1,500 W
5,000 W
112 W
450 W

Answer 1

The work done to push the puck is the product between the force F and the distance d:

$W=Fd=(750 N)(2.0 m)=1500 J$

And the power is the work done (W) per unit time (t):

$P=\frac{W}{t}$

Substituting the work done, W=1500 J, and the time taken, t=0.30 s, we find the power of the push:

$P=\frac{1500 J}{0.30 s}=5000 W$

Answer 2

Power, P = Force, F * Velocity, V

V = distance/time = 2/0.3 = 6.67 m/s

Therefore,
P = 750*6.67 = 5000 W