Considering the information presented in problem 55, answer the following questions: a) What is the velocity of the 5.0 kg block immediately after ...

Considering the information presented in problem 55, answer the following questions:
a) What is the velocity of the 5.0 kg block immediately after the collision?
b) What is the variation of the total kinetic energy?
c) In the new situation where v2f = 4.0 m/s, what is the variation of the kinetic energy?
d) Is it possible for the kinetic energy to increase? If so, give an example of how this could happen.
I- The velocity of the 5.0 kg block immediately after the collision is 2.0 m/s.
II- The variation of the total kinetic energy is -25 J.
III- The variation of the kinetic energy in the new situation where v2f = 4.0 m/s is +40 J.
IV- The kinetic energy can increase if there is a transfer of chemical energy to mechanical energy.
a) I and II are correct.
b) II and III are correct.
c) III and IV are correct.
d) I and IV are correct.