You push yourself forward 2 meters on a skateboard at an acceleration of 0.3 m/s/s. Your mass and the mass of the skateboard is 54 kg. How much work did you do?

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 .

Blank is the perceived frequency of a sound wave

Newton's second law states that f = m x a (force is mass times acceleration). which example would have the greatest acceleration?