Answer:
speed of a particle  = 2.31 ×  m/s
 m/s
energy of proton required = 27.77 KeV
energy of electron required =  15.171 eV
Explanation:
given data 
magnetic field of magnitude = 0.22 T 
electric field of magnitude = 0.51 MV/m
to find out
speed of a particle and energy must protons have to pass through undeflected and  energy must electrons have to pass through undeflected
solution
we know that force due to magnetic and electric field is express as
force due to magnetic field B = qvB    ..............1
and force due to electric field E = qE   .....................2
so without deflection force due to magnetic field  = force due to electric field  
so here qvB = qE
and V =  ...................3
    ...................3
put here value 
V =   
 
speed of a particle  = 2.31 ×  m/s
 m/s
and 
now energy of proton required will be here as 
energy of proton required = mass of proton × 
put here value 
energy of proton required = 1.67 ×  ×
 × 
energy of proton required = 4.45 ×  J
 J 
energy of proton required = 4.45 ×  J ÷ (1.602 ×
 J ÷ (1.602 ×  
 
energy of proton required = 27777.777 eV
energy of proton required = 27.77 KeV
and 
now we get here energy of electron required that is 
energy of electron required = mass of electron × 
put here value 
energy of electron required = 9.11 ×  ×
 ×  
 
energy of electron required =  24.305×  J
 J
energy of electron required =  24.305 ×  J ÷ (1.602 ×
 J ÷ (1.602 ×  
  
energy of electron required =  15.171 eV