Question

A steel ball of radius 2 cm is initially at rest. It is struck head on by another steel ball of radius 4em travelling with a velocity of 81 cm/s . If the collision is elastic their respective final velocities are 1) 63 cm / s . 144 cm / s 3) 19 cm / s , 100 cm / s 2) 144c / s, 63 cm / s 4) 100 cm / s , 9 cm / s​

Answer 1

Answer:

Using mom. conservation

81×8m=8m×v1+m×v2

648=8v1+v2

& e=81v2−v1=1

v2−v1=81

⇒v1=144 cm/s

v2=63 cm/s