Answer:
a) 

b) 

c) Impulse = 0 kg m/s²
d) percent decrease in kinetic energy = 47.85%
Explanation:
Let  be the initial velocity of rod A
 be the initial velocity of rod A
Let  be the initial velocity of rod B
 be the initial velocity of rod B
Let  be the final velocity of rod A
 be the final velocity of rod A
Let  be the final velocity of rod B
 be the final velocity of rod B
Using the principle of conservation of momentum:
 ............(1)
............(1)
Coefficient of restitution, 
 ........................(2)
........................(2)
Substitute equation (2) into equation (1)
 ..............(3)
..............(3)
Solving for  in equation (3) above:
 in equation (3) above:
 ....................(4)
....................(4)
From equation (2):
 ......(5)
......(5)
Substitute equation (5) into (1)
 ..........(6)
..........(6)
Solving for  in equation (6) above:
 in equation (6) above:
 .........(7)
.........(7)
b)
 
Rod A is said to be at rest after the impact, 
Substitute these parameters into equation (7)

To calculate the final velocity,  , substitute the given parameters into (4):
, substitute the given parameters into (4):

c) Impulse, 
 
I = 0 
d) %
%
% 