Two bodies move towards each other and hit inelastically. The speed of the first body is 2 m / s, its mass is 2.5 kg.

Two bodies move towards each other and hit inelastically. The speed of the first body is 2 m / s, its mass is 2.5 kg. Find the velocity of the second body with a mass of 0.5 kg, if the velocity after the impact is 1 m / s, how many percent of the kinetic energy of bodies is spent on irreversible deformation of bodies

According to the law of conservation of momentum:
2.5 * 2 + 0.5V = (2.5 + 0.5) * 1
0.5V = 3-5
v = -2: 0.5 = 4 m, s
according to the law of conservation of energy:
4 * 2.5 + 0.5 * 16 = 2 E + 3 * 1
10 + 8 = 2E + 3
2E = 18-3
2E = 15
E = 7.5 (J)
as a percentage, it will be as much – (7.5: 18) * 100 = 41.6%