Question

Шар массой 5 кг,движущийся со скоростью 10 м\с догоняет другой шар массой 20кг двидуйся со скоростью 18км/ч после чего шары вместе продолжают движение с какой скоростью движутся шары

Answer 1

18км/ч=5м/с

m1V1+m2V2=m1V1'+m2V2'
в векторном виде со стрелочками
V2'= V1'
m1V1+m2V2=m1V1'+m2V1'
m1V1+m2V2=(m1+m2)V1'
V1'=(m1V1+m2V2)/(m1+m2)
V1'=(5*10+20*5)/(5+20)=6м/с

Answer 2

Calculation of Final Velocity:

To determine the final velocity at which the two balls move together after the collision, we can use the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

The momentum of an object is given by the product of its mass and velocity. Therefore, the momentum of the first ball (mass 5 kg) before the collision is 5 kg * 10 m/s = 50 kg·m/s. The momentum of the second ball (mass 20 kg) before the collision is 20 kg * (18 km/h * (1000 m/1 km) * (1 h/3600 s)) = 1000 kg·m/s.

Since momentum is conserved, the total momentum after the collision is equal to the sum of the momenta before the collision. Therefore, the total momentum after the collision is 50 kg·m/s + 1000 kg·m/s = 1050 kg·m/s.

To find the final velocity, we divide the total momentum after the collision by the total mass of the system. The total mass is the sum of the masses of the two balls, which is 5 kg + 20 kg = 25 kg.

Therefore, the final velocity at which the two balls move together after the collision is 1050 kg·m/s / 25 kg = 42 m/s.

Answer:

The balls move together with a velocity of 42 m/s after the collision.