A point size mass 100 gm is rotated in a vertical circle using a cord of length 20cm. When the string makes an angle 60° with the vertical, the speed of the mass is 1.5m/s. The tangential accelaration of the mass in that position is……..ms^-2

• A

  4.9

• B

  4.9$\sqrt{2}$

• C

  4.9$\sqrt{3}$

• D

  9.8