Initial velocity(u)= 50m/s. t=2s. a= -9.8m/s². ( minus because acceleration is in downward direction). v=u+at. v= 50 - 9.8×2. v= 30.4m/s.
The material that is the best choice for the head of a hammer is a metal. Having a metal for a hammer head allows you to have a light-weight but heavy duty hammer. Since a hammer is a tool that is used to strike an object repeatedly, a light weight is essential since you would be repeatedly making that motion.
5.5 hours. In order to get this answer you divide 137.5 by 25. Hope this helps :)