A 12,000 kg train is traveling at 15.0 m/s. The engineer sees an abandoned motorcycle of mass 700 kg sitting on the track but knows he cannot stop in time to avoid a collision. What is the new velocity of the train and motorcycle together?

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 .