A) 1J
B) 1.25 J
C) 1.51 J
D) 1.75J
Correct Answer: B
Solution :
The change in mechanical energy \[\Delta U=mg(h+x)+\frac{1}{2}m{{v}^{2}}\] Here, \[m=5g=0.005\,kg,\,h=19.5\,m\] , \[x=50\,cm=0.5\,m,v=10\,m/s\], \[g=10\,\,m/{{s}^{2}}\] \[\therefore \] \[\Delta U=0.005\times 10\times 20+\frac{1}{2}\times 0.005\times 100\] \[=1+0.25\] = 1.25JYou need to login to perform this action.
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