96. Work A mover exert speed a on a crate as it is pushed 6.4 In Exercises 73-76, find the dot product of u. and v. inclined at an angle of 74. u = (-7, 12) work done in pushing 73. u = (6, 7) v = ( -4, -14) V = ( -3, 9) 76. u = -71 + 2j 6.5 In Exercises 97-10 75. u = 3i + 7j v = 161 - 12j find its absolute value. v = 1li - 5j 97. Ti In Exercises 77-80, use the vectors u =