2)A stone of 1kg is thrown with a velocity of 20m/s across the frozen

1.	2)A stone of 1kg is thrown with a velocity of 20m/s across the frozen surface of a lake and come to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?2 points- 4 N-2N-9N
Answer» Answer: hyy PLZ mark me as a brillent Explanation: INITIAL velocity of the stone, u= 20 m/s Final velocity of the stone, v= 0 Distance covered by the stone, s= 50 m We know the third equation of motion v²=u²+2as Substituting the known values in the above equation we get, 0² = (20)²+2(a)(50) -400 = 100a a = -400/100 = -4m/s² (retardation) We know that F = m×a Substituting above obtained value of a=-4 in F= m X awe get, F = 1×(-4) = -4N (Here the negative SIGN indicates the opposing FORCE which is Friction)

2)A stone of 1kg is thrown with a velocity of 20m/s across the frozen surface of a lake and come to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?2 points- 4 N-2N-9N

Answer»

Answer:

hyy PLZ mark me as a brillent

Explanation:

INITIAL velocity of the stone, u= 20 m/s

Final velocity of the stone, v= 0

Distance covered by the stone, s= 50 m

We know the third equation of motion

v²=u²+2as

Substituting the known values in the above equation we get,

0² = (20)²+2(a)(50)

-400 = 100a

a = -400/100 = -4m/s² (retardation)

We know that

F = m×a

Substituting above obtained value of a=-4 in F= m X awe get,

F = 1×(-4) = -4N

(Here the negative SIGN indicates the opposing FORCE which is Friction)

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