Question

The gravitational field in a region is 10 N/kg ( $\hat { \mathbf { i } }$ – $\hat { \mathrm { j } }$ ). Then the work done by gravitational force to shift slowly a particle of mass 1kg from point (1m, 1m) to a point (2m, –2m) is –

• A. 10 J
• B. –10J
• C. –40J
• D.
  • 40 J

Answer 1

Answer: (D)

• 40 J

Answer 2

W_g = . = 10 (–).(– 3)

= 10 + 30 = 40 J