A bullet or body decelerates uniformly while penetrating a medium (wooden block, plank), and the question asks for additional penetration distance or number of planks needed to stop it.
If a body looses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest? (1) 1 cm (2) 2 cm (3) 3 cm (4) 4 cm