Question

Two spheres of different masses moving in the same direction undergo perfect head on elastic collision.
Then,
a) Their velocities are interchanged if they are of same mass
b) If the heavier sphere were at rest before collision. it continues to be at rest after collision and the lighter sphere retraces its path with the same velocity
c) If the lighter sphere were at rest before collision, it moves with the velocity of the heavier sphere and the heavier sphere continues to move with its original velocity after collision.
d) If the lighter sphere were at rest before collision, it moves with double the velocity of the heavier sphere and the heavier sphere continues to move with its original velocity, after collision.

• A. a,b,c are correct
• B. a,b are correct
• C. b,c are correct
• D. a,b,d are correct

Answer 1

The correct option is D a,b,d are correct

A) Common result.
B) e.g Ball hitting a wall
C) $e=\frac{O-V}{V-V^1}=1$
$V^1=2V$
D) As in C