Question

Q no: 53
A 6kg mass travelling at 2.5 ms 1 collides
head on with a stationary 4kg mass. After the
collision the 6kg mass travels in its original
direction with a speed of 1ms-1. The final
velocity of 4kg mass is
A)​

Answer 1

Answer:

Use momentum conservation,

m

1

u

1

+m

2

u

2

=m

1

v

1

+m

2

v

2

But m

1

=6kg,m

2

=4kg, u

1

=2.5ms

−1

,u

2

=0ms

−1

,v

1

=1ms

−1

,v

2

=?

⇒6×2.5+4×(0)=6×1+4×v

2

⇒9=4v⇒v=2.25 ms

−1