they are reflected, refracted, or absorbed by the specimen.
you expect to have heat energy, electrical energy, and mechanical energy involved when you iron your clothes.
you don't expect chemical energy to show up, and if it does, it may ruin some of your clothes.
we can get the answer just by using momentum and impulse formula. m=800kg, v1=32m/s, f=180,000n, t=25s. formula is: f*t=m*(v2-v1). than we get: 180,000n*25s=800kg*(v2-32m/s). v2=5657m/s
the answer is c. the mass of the platinum sample is greater than the mass of the lead sample. as i explained in a previous answer, if they are the same volume, but one is heavier, then it must be more dense. in this particular example, the platinum is more dense than the lead, and therefore has more mass.