A heavy block kept on a frictionless surface and being pulled by two ropes of equal mass \( \mat...

A heavy block kept on a frictionless surface and being pulled by two ropes of equal mass \( \mathrm{m} \) as shown in figure. At \( t=0 \), the force on the left rope is withdrawn but the force on the right end continues to act. Let \( F_{1} \) and \( F_{2} \) be the magnitudes of the forces by the right rope and the left rope on the block respectively.
(a) \( F_{1}=F_{2}=F \) for \( t0 \)
(b) \( F_{1}=F_{2}=F+m g \) for \( t0 \)
(c) \( F_{1}=F, F_{2}=F \) for \( t0 \)
(d) \( F_{1}F, F_{2}=F \) for \( t0 \)