A moving neutron collides with astationary a

A moving neutron collides with a
stationary a – particle. The fraction of the kinetic energy lost by
the neutron is

As we know

E_t =	1	mu².E_f =	1	mv²
	2		2

Fraction of energy lost

=	E_t - E_f
	E_t

= 1 -		v		²	= 1 -		m - 4m		²
		u					m + 4m

= 1 -	5	=	16
	25		25