For number 5 find acceleration, part b the time of travel through the barrel For number 6 not sure how do we find the formula ?

5) A bullet emerges from the 59.1 cm barrel of a rifle at 905 m/s. Find: (a) its acceleration; (b) the time of travel through the barrel. 6) A student late to class runs at a constant 4.30 m/s to catch a bus. She reaches the bus stop 2.00 s after the bus starts from rest with an acceleration of 0.950 m/s2. Where and when does the student catch the bus