A particle starts from rest with constant acceleration for 30sec.  If it travels a distance $y_1$  in the first 10 sec and a distance  $y_2$ in the next 20 sec then

• A

  ${\text{y}}_{\text{2}}{\text{ = 2y}}_{\text{1}}$

• B

  ${\text{y}}_{\text{2}}{\text{ = 3y}}_{\text{1}}$

• C

  ${\text{y}}_{\text{2}}{\text{ = 8y}}_{\text{1}}$

• D

  ${\text{y}}_{\text{2}}{\text{ = 5y}}_{\text{1}}$