When two soft, deformable objects such as two balls of putty collide, A)the internal energy is conserved
B) the kinetic energy is conserved
C) chemical energy is conserved as the objects get warmer
D) the sum of the kinetic energy and the internal energy is conserved

D) the sum of the kinetic energy and the internal energy is conserved

Explanation:

When  soft deformable objects such as two balls of putty collide, their total energy will be conserved , according to law of conservation of energy .

Their energy involves kinetic energy and potential energy . Their kinetic energy is due to their motion . Their potential energy is due to their shape . If there is change in their shape , there will be change in their potential energy .

Their internal energy consists of potential energy and thermal energy . Due to collision , heat will be produced so their thermal energy will also change . In this way there will be change in their internal energy .

But in spite of all these changes , total energy will be conserved . That means if one form of energy is reduced , the other kind will be increased  and so on.

Hence  the sum of the kinetic energy and the internal energy is conserved

do you have a formula possibly