Question

40. Find the work done in moving a
particle along a vector r = (31 - j + 6k)
meter. If the applied force is F = (1 + 3j +
2k ) N*
O (A) 10 joule
O (B) 12 joule
O (C) 11 joule
O (D) 9 joule​

Answer 1

Explanation:

W = F.s

W = (i + 3j + 2k).(3i - j + 6k)

W = (1)(3) + (3)(-1) + (2)(6)

W = 3 - 3 + 12

W = 12 J

Answer is (B)