1.The initial velocity of the brick in position A is 40 ft/s. If the coefficient of kinetic friction between the block and the plate is .40, determine the time it takes the block to reach position b on the horizontal axis.
2.A beam with a 20 ft simple span has cross- section dimentions b= 12" d=12 in and h=25in . it carries a uniform service load of 2450 lb/ft in addition to its own weight. material strengths are f'c=4000psi and fy=60000psi .assume a weight od 150 pcf for reinforced concrete.