Answer:
0J
Explanation:
Mass of the lump M1 = 1.0 kg, initial velocity of the lump U1 = 2m/s to the right,
mass of the metal sphere M2 = 0.5kg, initial velocity of the metal sphere M2 = -4m/s to the left. using conservation law of momentum;
M1U1 + M2U2 = V (M1 + M2)
(1.0 × 2) + (0.5 × -4) = V (1 + 0.5)
2 -2 = V (1.5)
0 = V (1.5)
divide both side by 1.5
0/1.5 = V 1.5/1.5 
V = 0
since final velocity after sticking together of the two masses equals zero then their combined kinetic energy will also equal to zero 
1/2 V(M1 +M2) 
1/2 ×0 × 1.5 = 0J
 
        
             
        
        
        
Answer: c) Taking 
Explanation: 1.2.14 quiz correct answer
 
        
             
        
        
        
Mondays and Thursdays is only 2 days a week. So 2.15x2 is 4.3 hours a week. 4.3x3= 12.9 hours every 3 weeks or 12 hours and 54 minutes