Question

3. A particle is moved from A=i+2j-k by unit distance
along X-axis by the application of force F=21-2j+k
then the work done is:
1) 1 unit 2) 2 units 3)-3 units 4)-2 units​

Answer 1

Answer:

2 units

Explanation:

A particle is moved from A=i+2j-k by unit distance  along X-axis

Thus, Displacement, s = 1i

force, F=2i-2j+k

Work done = F.s = (2i-2j+k) . (1i) = 2*1 - 2*0 + 1*0 = 2

Hence work done is 2 units.