Question

A hockey puck is struck so that it slides at a constant speed and strikes the far side of the rink, 58.2 m away. The shooter hears the sound of the puck after 1.9 seconds. The speed of sound is 340 m/s.

How fast was the puck moving?

Answer 1

`v = 33.66 m/s`

Step-by-step explanation:

Let hockey puck is moving at constant speed v

so here we have

`d = vt`

so time taken by the puck to strike the wall is given as

`t = (58.2)/(v)`

now time taken by sound to come back at the position of shooter is given as

`t_2 = (58.2)/(340)`

`t_2 = 0.17s`

so we know that total time is 1.9 s

`1.9 = t + t_2`

`1.9 = t + 0.17`

`1.9 - 0.17 = t`

`t = 1.73 s`

now we have

`1.73 = (58.2)/(v)`

`v = 33.66 m/s`