• A dog runs 33 m to the east in 9.0 s, then turns and runs 13 m to the west in 4.3 s. Assume movement to the east corresponds to positive displacement.
What is the average velocity of the dog?
What is the dog's average speed?

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 .