## Physics (10th Edition)

Let up be the positive direction. The extra time taken by the pellet from gun A is the time taken for it to go up and come back down to the cliff edge. Its velocity when it comes back to the cliff edge is -30.0 m/s due to symmetry $v=u+at$ $t=\frac{v-u}{a}$ $t=\frac{(-30.0)-(30.0)}{(-9.8)}\approx6.12\; s$