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)