Two persons, A of mass `60 kg` and `B` of mass `40 kg`, are standing on a horizontal platform of mass `50 kg`. The platform is supported on wheels on a horizontal frictionless surface and is initially at rest. Consider the following situations. (i) Both `A` and `B` jump from the platform simultaneously and in the same horizontal direction. (ii) A jumps first in a horizontal direction and after a few seconds `B` also jumps in the same direction. In both the situations above, just after the jump, the person (`A` or `B`) moves away from the platform with a speed of `3 m//s` relative to the platform and along the horizontal. In situation (i), just after both `A` and `B` jump from the platform, velocity of centre of mass of the system (`A, B` and the platform) isA. `2m//s`B. `6m//s`C. `5m//s`D. none of these

Two persons, A of mass `60 kg` and `B` of mass `40 kg`, are standing o

1.	Two persons, A of mass `60 kg` and `B` of mass `40 kg`, are standing on a horizontal platform of mass `50 kg`. The platform is supported on wheels on a horizontal frictionless surface and is initially at rest. Consider the following situations. (i) Both `A` and `B` jump from the platform simultaneously and in the same horizontal direction. (ii) A jumps first in a horizontal direction and after a few seconds `B` also jumps in the same direction. In both the situations above, just after the jump, the person (`A` or `B`) moves away from the platform with a speed of `3 m//s` relative to the platform and along the horizontal. In situation (i), just after both `A` and `B` jump from the platform, velocity of centre of mass of the system (`A, B` and the platform) isA. `2m//s`B. `6m//s`C. `5m//s`D. none of these
Answer» Correct Answer - D Centre of mass will remain at rest because there isno external force on the system of `A,B` and platform

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