Spaceship alpha moves at a velocity of 0.80c in the y direction. spaceship boom moves in the -x direction at a speed of 0.60c. both relative to the earth. let the earth be stationary frame k. let spaceship boom be the moving frame k'. part a) what are v, ux, and uy? part b) calculate ux' and uy' which are components of spaceship alpha's velocity in the k' frame.

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 .