Answer:
Step-by-step explanation:
Given : r = 3i+2j-5k
f = 2i-j-k
To find : Work done (w)
Formula : w= F.r
Solution :
According to the given formula,
w = F. r
w = (2i -j-k). (3i+2j-5k)
w = [(2*3) - (1*2) + (-1)(-5)]
w = 6-2+5 = 9J
Therefore work done in moving a object is 9J.
