Question

A 0.1 kg ball moving at a speed of 10 ms collides with an identical ball at rest. After collision, the two balls move symmetrically each making an angle or su with the original direction of motion of the moving ball. Find the new speed of each ball. Is the collision elastic? ​

Answer 1

Answer:

The collision is symmetric,the two blocks will acquire velocity in direction 30

∘

from horizontal.

writing momentum balance equation in x direction

m×10=mv

′

+2mvcos30...(i)

where v

′

is velocity of block A after collision and v is magnitude of velocity of blocks B and C after collision.

using Kinetic energy conservation

2

1

m10

2

=2∗

2

1

mv

2

+

2

1

mv

′2

...(ii)

solving the equation (i) and (ii)

v

′

=−2m/s;v=6.93m/s