A hockey puck slides across the surface of the ice towards your teams net at 15 m/s. The puck is approximately 20 meters away from the front of the goat and your hockey stick is 10 meters from the front of the goal. How fast must you move to intercept the puck before the other team scores?

Question

Quizplus · Accepted Answer

Step 1: Find the time that the puck will take to reach the goal
To determine the velocity of an object:
V=d/t
d = displacement
t = time
To find the time, given the velocity and the displacement, we multiply both sides by time:
v=d/t
vt=d
Then, we divide by velocity to isolate time:
t=d/v
In this case:
d = 20 m toward the goal
v = 15 m/s
t = 20m / 15m/s = 1.33 seconds until the puck reaches the goal
Step 2: Find the velocity you must move to intercept the puck in this time
To determine the velocity of an object:
V=d/t
d = displacement
t = time
In this case:
d = 10 m toward the goal
t = 1.33 seconds
v = 10m / 1.33s = 7.5 m/s
You must move faster than 7.5 m/s toward the goal to stop the other team from scoring

A Hockey Puck Slides Across the Surface of the Ice