a hockey puck slides over ice with kinetic friction coefficient is 0.013. What initial speed should the puck have so it travels the 50m length of the rink?

Question

a hockey puck slides over ice with kinetic friction coefficient is 0.013. What initial speed should the puck have so it travels the 50m  length of the rink?

jamesj · Answer

After the puck is launched it is constantly accelerated by the friction force,
$$ F_f = -\mu N = -\mu mg = -m(\mu g) $$
Hence the acceleration is $ a = -\mu g $.  

Now use a kinematic equation for distance of a body being constantly accelerated to find the initial velocity necessary to travel exactly 50 meters.

jamesj · Answer

Make sense?