A 0.4 kg puck sliding on a flat frozen lake with aninitial speed of 0.50 m/s und

Question

A 0.4 kg puck sliding on a flat frozen lake with aninitial speed of 0.50 m/s undergoes a uniform deceleration. 12seconds later it comes to a stop. Find.... A.) the acceleration of the puck B.) the distance it slides through before it stops C.) the frictional force on the puck. A 0.4 kg puck sliding on a flat frozen lake with aninitial speed of 0.50 m/s undergoes a uniform deceleration. 12seconds later it comes to a stop. Find.... A.) the acceleration of the puck B.) the distance it slides through before it stops C.) the frictional force on the puck.

Explanation / Answer

let deceleration or negative acceleration=-am/s2initial velocity=u=0.5 final velocity=v=0 time =t=0.12 s v=u+a*t 0=0.5-a*0.12 a=4.17 m/s2 acceleration of the puck= -4.17 m/s2 let distance it slides=s v2=u2+2*a*s 0=0.52-2*4.17*s s=0.03 m (ans b) the deceleration is caused by friction mass= 0.4 kg frictional force=mass*acceleration                     =0.4*4.17                     =1.67 N (ans c)

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