Question

ball A of mass 5.0 kg moving at 20 meters per second collides with ball B of unknown mass moving at 10. meters per second in the same direction. After the collision, ball A moves at 10 meters per second and ball B at 15 meters per second, both still in the same direction. What is the mass of ball B

Answer 1

Answer:The mass of ball B is 10 kg.

Explanation;

Mass of ball A =
`M_A=5 kg`

Velocity of the ball A before collision:
`U_A=20 m/s`

Velocity of ball A after collision=
`V_A=10 m/s`

Mass of ball B=
`M_B`

Velocity of the ball B before collision:
`U_B=10 m/s`

Velocity of ball B after collision=
`V_B=15 m/s`

`M_AV_A+M_BV_B=M_AU_A+M_BU_B`

`5 kg* 10 m/s+M_B* 15=5 kg* 20m/s+M_B* 10m/s`

`M_B=10kg`

The mass of ball B is 10 kg.