Question

An insulated particle of mass `m` is moving in a horizontal plane (x - y) along X-axis. At a certain height above the ground, it suddenly explodes into two fragments of masses `m//4 and 3 m//4`. An instant later, the smaller fragment is at `Y = + 15`. The larger fragment at this instant is at :
A. `y = -5 cm`
B. `y = +20 cm`
C. `y = + cm`
D. `y = -20 cm`

Answer 1

Correct Answer - A
`Deltabar(y) = (m_(1)Deltay_(1) + m_(2)Deltay_(2))/(m_(1) + m_(2))`
`rArr 0 = (m)/(4) (15) + (3m)/(4) (y_(2))`
`rArr = y_(2) = -5 cm`