RRB Paramedical Staff Nurse Model Paper 1

Question : 100 of 100

Marks: +1, -0

A moving body of mass m and velocity 3 km/h collides with a body at rest of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity

3 km/h
2 km/h
1 km/h
4 km/h

Validate

Solution:

Initial momentum

=m × 3+2 m × 0=3 m

Final momentum

=3 m × V

By the law of conservation of momentum

3 m=3 m × V ⇒ V=1

km/h

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