consider a head on collision between two particles of masses `m_1 and m_2`. The initial speeds of the particles are `u_1 and u_2` in the same directioin. The collision starts at t=0 and the particles interact for a time inteval `/_\t.` Lduring the collision the speed o the first particle varies as
`v(t)=u_1+t//_\(v_1-u_1)` Find the speed of the second particle as as function of time during the collision.