Question

A hockey puck has a mass of 0.21 kg. If the hockey puck

is moving with 74 J of kinetic energy, what is its speed?
Show all your work.

Answer 1

v = 26.54 m/s

Step-by-step explanation:

Given that,

The mass of a hockey puck, m = 0.21 kg

The kinetic energy of the hockey puck, E= 74 J

We need to find the speed of the hockey puck. Let the speed is v. We know that, the kinetic energy is given by :

`E=(1)/(2)mv^2`

Where

v is the speed

So,

`v=\sqrt{(2E)/(m)} \\\\v=\sqrt{(2* 74)/(0.21)} \\\\v=26.54\ m/s`

So, the speed of the hockey puck is 26.54 m/s.