A child's sled has rails that slide with little friction across the snow. Logan has an old wooden sled with heavy iron rails that has a mass of 9.0 kg quite a bit for a 27 kg child. Logan runs at 3.8 m/s and leaps onto the stationary sled and holds on tight as it slides forward. The impact time with the sled is 0.28 s.
(a) Immediately after Logan jumps on the sled, how fast is it moving?
(b) What was the force on the sled during the impact?
(c) How much energy was "lost" in the impact?
(d) Where did this energy go?

The amount of potential energy possessed by an elevated object is equal to what?

At what time will the interfering waves have an amplitudeof zero?

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)