Question

A body is displaced from rA= 2i+ 4j- 6k to rB =6i-4j+2k
under a constant force F = 2i + 3j-k. Find the work done?​

Answer 1

Explanation:

Given :-

• rA = 2i + 4j - 6k
• rB = 6i - 4j + 2k
• r = rB – rA
• r = 6i - 4j + 2k - (2i + 4j - 6k)
• r = 4i - 8j + 8k
• F = 2i + 3j - k
• W = F . r
• W = (2i + 3j - k) . ( 4i - 8j + 8k)
• W = 8 - 24 - 8
• W = - 24 units

Answer 2

Answer:

here displacement is a scalar and force is a vector quantity