1.

A spring of constant 5 xx 1 0 ^(3)N/m is stretched initially by 5 cm from the unstreched position. Then the work required to stretch it further by another 5 cm is:

Answer»

6.25 N-m
12. 50 N-m
18. 75 N-m
25.00 N-m

Solution :Here, `W = 1/2 K(x_2^2 - x_1^2) = 1/2 xx 5 xx 10^3 [(10/100)^2 - (5/100)^2] = 1/2xx (5 xx 10^3)/(10^4) [100 - 25] = 75/4 = 18.75 J`.


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