Question

two objects each of mass 1.5 kg are moving in the same straight line But in opposite directions the velocity of each object is 2.5 m/s before collision during which the strike together find the velocity of combined object after collision

Answer 1

Mass of object 1 before collision = 1.5 kg

Mass of object 2 moving in opposite direction before collision = 1.5 kg

Velocity of object 1 before collision = 2.5 m s-1

Velocity of object 2 moving in opposite direction before collision = -2.5 m s-1

After collision,

Object 1 sticks to object 2

So, the total mass of the combination = m1+m2

= 1.5 + 1.5 = 3 kg

Let us consider that the velocity of the combination becomes v.

Then, according to the law of conservation of momentum,

Total momentum before collision = Total momentum after collision

So, m1v1 + m2v2 = (m1+m2)v

That is, (1.5 * 2.5) + (1.5 * -2.5) = 3 * v

3.75 – 3.75 = 3v

Therefore, v = 0 m/s

Answer 2

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