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Let 'f' be the coefficient of friction & using ‘g’=10
At final point, the block came to rest,
So at that point force acting in forward direction will be equal to frictional force.
f*mg=m*a
f*g=a
0.10*10=a
a=1
We know that:
v^2 - u^2 = 2as
0-100=2*1*s
s=50
Negative sign appears due to retardation.
Regards
Arun (askIITians forum expert)
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