A) 25 J
B) 20 J
C) 30 J
D) 5 J
सही उत्तर: A
( F=20+10y )
( W=\int\limits_0^{1}{(20+10y)dy} )
( =20[y]_0^{1}+[\frac{10y^{2}}{2}]_0^{1} )
( =20+5 )
( =25 )
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