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 answer is a. hope this .

answer///scientific method;

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.