A body is suspended by a string from the ceiling of an elevator. It is observed that the tension in the string is doubled when the elevator is accelerated. The acceleration will be

Question

\[(a)\;4.9\; m/s^2 \quad (b)\;9.8\; m/s^2 \quad (c)\;19.6 \; m/s^2 \quad (d)\;2.45\; m/s^2\]