A mass of $2.9 $ kg is suspended from a string of length $50\; cm$ and is at rest. Another body of mass $q00 \;g$, which is moving horizontally with a velocity of $150\;m/s$ strikes and sticks to it. Subsequently when the string makes an angle of $60^{\circ}$ with the vertical, the tension in the string is $(g=10 m/s^2)$