Sketch the graph of the relation between the extension of a spiral spring and the load attached to it when it is gradually loaded up to the elastic limit. If the spring has a stiffness of 950 Nm-¹, what work will be done in extending the string by 60 cm?

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 .