Question

A 4kg eagle picks up a 75g snake and raises it 2.5 m from the ground to a branch. What is the work done to raise the bird’s own centre of mass to the branch? (Assume g = 10 m/s^2)

(a) 100 J

(b) 1.875 J

(c) 118.75 J

(d) 10 J

This question was posed to me in exam.

I'm obligated to ask this question of Gravitational Potential Energy topic in division Gravitation of Physics – Class 11

Answer 1

Correct choice is (a) 100 J

Easy explanation: The work done to raise the bird’s own centre of mass to the branch depends only on the mass of the bird.

Hence, the work done = (4 x 10 x 2.5) J

 = 100 J.