In the stream, water waves bunched up as the water flowed by. As we
moved the disturbance up stream, the water bunched up even more. An
airplane can travel at the same speed as sound does, about 340 m/s.
When it does, is it logical that the airplane would experience a wave wall
barrier, ie, a sound barrier?
O yes
O No

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 .