A stone of 1kg is thrown with a velocity of 20ms-1 across the 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.
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V²-U²/2S=A(RETARDATION DUE TO FORCE OF FRICTION)
400/100
4M/S²=A
FORCE OF FRICTION= 4N
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