A ball of mass 10 g is projected upward with an initial velocity 10 m/s and comes back and finally achieved a velocity of 5 m/s at the point of projection. Find the work done by air resistance.

Q: A ball of mass 10 g is projected upward with an initial velocity 10 m/s and comes back and finally achieved a velocity of 5 m/s at the point of projection. Find the work done by air resistance. (Neglect buoyancy force due to air)

(a) 0.375 J

(b) 0.275 J

(c) – 0.375 J

(d) Zero

Ans: (c)