Work Energy and Power - Result Question 65

68. A body of mass m moving with velocity 3km/ h collides with a body of mass 2m at rest. Now the coalesced mass starts to move with a velocity

[1996]

(a) 1km/h

(b) 2km/h

(c) 3km/h

(d) 4km/h

Show Answer

Answer:

Correct Answer: 68. (a)

Solution:

  1. (a) Applying law of conservation of momentum,

m1u1+m2u2=(m1+m2)v

or, m1u1=(m1+m2)v(∵u2=0)

⇒m(3×1000)3600=3m(v)

⇒v=10003600m/s=1km/hr

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