Elements with low specific heat values have which characteristic?
low atomic mass
high thermal energy
low kinetic energy
Tow number of atoms per gram

Ibelieve the correct answer would be c.

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared. 

The answer is d, you can easily test a theory! hope i you : )