Define the term physics as used in science,…..,….plllllsssssss

Help me solve the attached assignment. Mak e sure to show all steps.

1,Consider 2 similar situations. First, a snow sled is initially traveling with a velocity along horizontal snow and comes to a stop through friction. A second snow sled is traveling the same initial

. The momentum of two bodies of masses 1 kg and 4 kg are equal .Compare thier kinetic energies