A Slinky (spring) having an unstretched length close to zero behaves like a string as far as the speed of transverse waves propagating along it. (i.e. v² = F/(m/L) ). A Slinky of mass m = 0.05 kg is stretched to a length of L₁ = 6 m . When a wave pulse is shaken into it, the pulse takes t₁ = 0.8 s to travel to the other end.

The Slinky is now stretched to a new length of L₂ = 10.2 m. How long does it take a wave pulse to travel the new 10.2 m length of the Slinky?

t₂ = s