50
If the area of the base of a cone is $51$ cm$^2$ and its volume is $85$ cm$^3$, then the vertical height of the cone is given as :
- (a)$\frac{5}{6}$ cm
- (b)$\frac{5}{3}$ cm
- (c)$\frac{5}{2}$ cm
- (d)$5$ cm
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(d) $5$ cm