In which of these situations is the most work being done? A ) Jeremy pushed a car up a steep B) Joe rolled a wagon down a small C) Jenny stood on one leg for 15 minutes D ) Johnny rolled a skateboard across his driveway.

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 .