Answer:
Explanation:
Given
mass of each railroad is M
first railroad is moving with velocity
and other two's with 
conserving Momentum

where v_f is the final velocity of combined system
(b)Initial Kinetic Energy


Final Kinetic Energy

Loss in Kinetic Energy


Answer:
metals like iron or nickel
Explanation:
Answer:
The coefficient of kinetic friction between the block and the surface is 0.127.
Explanation:
Given that,
The mass of a block, m = 4 kg
The acceleration of the block, a = -1.25 m/s²
We need to find the coefficient of kinetic friction between the block and the surface. The force of friction is given by :

So, the coefficient of kinetic friction between the block and the surface is 0.127.
Answer:
Explanation:
The answer is in the picture