Question

A force $\vec { F } = 3 \hat { i } + \hat { c j } + 2 \hat { k }$ acting on a particle causes a displacement $\vec { S } = - 4 \hat { i } + 2 \hat { j } - 3 \hat { k }$ in its own direction. If the work done is 6J, then the value of c will be

• A. 12
• B. 6
• C. 1
• D. 0

Answer 1

Answer: (A)

12

Answer 2

$= - 12 + 2 c - 6$

Work done (given)

$\therefore$ $- 12 + 2 c - 6 = 6$ $\Rightarrow$ $c = 12$