Question

If a force applied on an object making an impact 3 + 2 j - 53 is too i - 4 - k what is the work done by the object

Answer 1

workdone = (3 + 2j - 53 )× ( i -4 -k )
W = 3×1 + 2×-1 -53×-1
W = 3 -2 +53
W = 54 joule