A200 g arrow is fired and becomes embedded in a 1.8 kg wooden block that is initially at rest and suspended by a string of length 0.50 m. the arrow and the block displace an angle of 60° to the vertical after the impact. find the initial velocity, v, of the arrow before it hits the block.

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.