Question

A ball of soft clay with mass 1 kg falls from a height of 10 m starting at rest. When the clay hits the ground it flattens and comes to a stop. Which of the following is true? Gravity does work on the ball equal to 980 J, and all this energy is dissipated during the deformation of the ball on impact. Gravity does work on the ball equal to 98 J, and all of this energy is dissipated during the deformation of the ball on impact. O C. Gravity does no work on the clay ball because its initial and final kinetic energy are zero. O D. Gravity does no work on the clay ball because the force is perpendicular to the motion.

Answer 1

. u=o tu=?? just befor hilting Wgravin - AKE = 1 mv2 v=√2 as tu? = √2aH = √2x 10x9.8 :: Wgrowiny = I x 1 x(d2 x 10 x9.8) ² = 985 ② option correct) t=2 sec i =lomis 45 -->- Horizontal veroolly = v sino= 10x sin 45 Horizontal distance = vsinot = 10x sin 45 x 2 = 14m lapp) I option correu

> my sin mycos force parallel to inclined plane = mgsino option mgsino v=4 m/s vomis m=5ookg s-lom Change in kinetic Energy = mv² = x 500 x 42 = 4000 J Energy lost in noise, he aut = 500J " Chanse in energy = (4000-500) J by friction - 3500 J option © 35005
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