a stone of 1kg is thrown with a velocity of 20m/s. across a frozen surface of a lake and comes to rest after travelling a distance of 50m. what is the force of friction between the stone and the ice.

v=0,

u=20m/s,

s=50 m

m=1kg 

using 3rd equation of motion 

v2=u2+2as

02=202+2xax50

400+100a

-400=100a

-400/100=a

-4m/s2= a

f= mxa 

f= 1x -4 

f= -4 N  { "--"  minus sign shown the direction of force }
 

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