If $\cos (A-B)=3/5$ and $\tan A \tan B=2$,then which one of the following is true?

An object is attached to the bottom of a light vertical spring and set vibrating. The maximum speed of the object is $15 ~cm/s$ and the period is $628 ~ms$. The amplitude of the motion in $cm$ is:

Two capacitors of capacities $1 \mu F$ and $C \mu F$ are connected in series and the combination is charged to a potential difference of $120 \ V$. If the charge on the combination is $80 \mu C$,the energy stored in the capacitor of capacity $C$ in $\mu J$ is

Which vegetable crop,released by $IARI$ New Delhi,is enriched with Vitamin $C$?

The vertices of a hyperbola are at $(0, 0)$ and $(10, 0)$ and one of its foci is at $(18, 0)$. The equation of the hyperbola is

Let $u$ and $v$ be two vectors. Then,$|u-v|=||u|-|v||$ if and only if