Question

ALL VIII 1.a If a body loses half of its velocity on penetrating 3 cm in a wooden block, the City on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest? (AIEEE 2002, 4/300 (1) 1 cm (2) 2 cm (3) 3 cm (D) 4 cm and downwards the

JEE/Engineering Exams

Physics

Solution

125

4.0 (1 ratings)

let the thutal welocuty for body be ( v ) thene funl veloculy ( =Y / 2 ) Applycy ( a^{prime} v^{2}=u^{2}-2 a ) [ left(frac{v}{2}right)^{2}=v^{2}-2 a cdot 3 ] ( Rightarrow quad a=frac{v^{2}}{8} ) Th 2nd care, wher the body comer to rent fund velocuty ( =0 ) untral velouly ( =frac{v}{2} ) [ begin{array}{l} (0)^{2}=left(frac{v}{2}right)^{2}-2 xleft(frac{v}{8}right)^{2} cdot s_{1} s_{1}=1 mathrm{cm} end{array} ]