A 1.33 kg mass is attached to a spring (k = 40 N/m) on a level surface without friction. It is pulled the right 0.4 m (a) and released. When it reaches the equilibrium position ((b), x=0), how fast is it traveling?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .