Question

A particle of mass m moving with velocity ν northwards, collides with another particle of mass m moving with velocity ν eastwards. After the collision the two particles coalesce. What is he velocity of the new particle ?

(a) √2ν north east

(b) ν/√2 north east

(c) 2ν north east

(d) ν/2 north east

Answer 1

Answer is (b) ν/√2 north east

2mV = i mν + j mν.

Hence V = ν/√2 north east