Ralph is also swinging at the park. he has a mass of 72.6 kg, and his maximum velocity at the lowest point in his swing is 7.3 m/s. what is ralph’s maximum kinetic energy? hint: kinetic energy = 1/2 mass x velocity-squared

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 .