A bullet is shot vertically downwards with an initial velocity of \( 100 \, \text{m/s} \) from a certain height. Within \( 10 \, \text{s} \), the bullet reaches the ground and instantaneously comes to rest due to the perfectly inelastic collision. The velocity-time curve for total time \( t = 20 \, \text{s} \) will be: (Take \( g = 10 \, \text{m/s}^{2} \)).
