Question

5. Two objects, each of mass
1.5 kg are moving in the same
straight line but in opposite
direction. the velocity of each
object is 2.5 m/s before the
collision during which they
stick together. What will be the
velocity of the combined object
after collision ?
0 m/s
2 m/s
3 m/s
1 m/s​

Answer 1

Answer:

Given : m

1

=m

2

=1.5 kg

u

1

=2.5 ms

−1

u

2

=2.5 ms

−1

Total mass of the combined system, M=m

1

+m

2

=2×1.5=3kg

Let the velocity of the combined system after the collision be v

Applying conservation of momentum before and after the collision :

m

1

u

1

−m

2

u

2

=Mv

1.5×2.5−1.5×2.5=3v

⟹v=0