Question

A ball is given a speed v on a rough horizontal surface. The ball travels through a distance l on the surface and stops. (a) what are the initial and final kinetic energies of the ball? (b) What is the work done by the kinetic friction?

Answer 1

Answer:

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l

Answer 2

Explanation:

(a) Initial Kinetic vitality of the ball  $\begin{equation}=\frac{m v_{0}^{2}}{2}$

Last Kinetic Energy of the ball = 0

(b) Forces on the ball are weight, ordinary power and dynamic erosion. Since weight and typical power are equivalent and inverse, the resultant power on the ball is equivalent to active grinding. Work done by the resultant power is equivalent to change in dynamic vitality, so work done by active grating

= final kinetic energy - Initial Kinetic energy of the ball  

$\begin{equation}=0-\frac{m v_{0}^{2}}{2}=-\frac{m v_{0}^{2}}{2}$