## Physics (10th Edition)

Let down be the negative direction a) $v=u+at$ $u=v-at$ $u=(15)-(-9.8)(2.0)=34.6\; m/s$ b) $v=u+at$ $v=(34.6)+(-9.8)(5.0)=-14.4\; m/s$ OR, without using the answer from part a $v=u+at$ $v=(15)+(-9.8)(5.0-2.0)=-14.4\; m/s$ Hence, the speed is 14.4 m/s.