Question

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Question :-
Two objects, each of mass 1.5 kg. are moving straight line but in opposite directions. The velocity of each object is 2.5 ms before the collision during which they stick together. What will be the velocity of combined objects after collision ?


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Answer 1

Answer:

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Explanation:

Given that

Mass of one of the objects,m1 = 1.5 kg

Mass of the other object, m2 = 1.5 kg

Velocity of m1 before collision, u1 = 2.5 m/s

Velocity of m2, moving in opposite direction before collision, u2 = -2.5 m/s

Find out

The velocity of the combined object after collision

Solution

Let v be the velocity of the combined object after the collision. By the law of conservation of momentum,

Total momentum after collision = Total momentum before collision,

Or, (m1 + m2) v = m1u1 + m2u2

Or, (1.5 + 1.5) v = 1.5 (2.5) + 1.5 (-2.5) [negative sign as moving in opposite direction]

Or, v = 0

Thus, the velocity of the combined object after the collision is 0 m/s

Answer

The velocity of the combined object after the collision is 0 m/s