An elevator ascends with an upward acceleration of 1.75 m/s2. At the instant its upward speed is 2.0 m/s, a loose bolt drops from the ceiling of the elevator 3.5 m from the floor. Calculate the time of flight of the bolt from the ceiling to the floor. Assume that the elevator continues its upward acceleration. (Use a frame of reference fixed with respect to the elevator shaft.)

A)-in the process of engineering design, explain the contribution of material selection. b)- explain the procedure of synthesis as is employed in engineering design. c)- is there any relationship between ergonomics and engineering design? explain. d)- safety consideration in engineering design includes human, product and the enviroment . explain how safety will be incorporated into the design?