Embibe Experts Solutions for Chapter: Friction, Exercise 8: Exercise (Analytical Questions)

Which one of the following statements is incorrect?

A particle is moving on rough horizontal ground with an initial velocity $v_0$. If ${\frac{3}{4}}^{\mathrm{t}\mathrm{h}}$ of its kinetic energy is lost due to friction in time $t_0$, then the coefficient of friction between the particle and the ground is

A ladder rests against a frictionless vertical wall, with its upper end $6\mathrm{m}$ above the ground and lower end $4\mathrm{m}$ away from the wall. The weight of ladder is $500\mathrm{N}$ and centre of
gravity $=\left(\frac{1}{3}\right)rd$distance from the lower end. Wall's reaction will be, in $\mathrm{N}$