The number of five-digit numbers divisible by $5$ that can be formed using the digits $0, 1, 2, 3, 4, 5$ without repetition is:

Two bodies are thrown up at angles of $45^{\circ}$ and $60^{\circ}$,respectively,with the horizontal. If both bodies attain the same vertical height,then the ratio of velocities with which these are thrown is:

Four particles $A, B, C$ and $D$ of equal mass $m$ are placed at the four corners of a square. They move with equal uniform speed $v$ towards the intersection of the diagonals. After the collision,particle $A$ comes to rest,particle $B$ traces its path back with the same speed $v$,and particles $C$ and $D$ move with equal speeds $v'$. What is the velocity of particle $C$ after the collision?

The ratio between kinetic and potential energies of a body executing simple harmonic motion,when it is at a distance of $\frac{1}{N}$ of its amplitude from the mean position is

If an organism is in the same $Class$ but not in the same $Family$, then it may belong to the same:

The equation of the circle concentric with the circle $x^2+y^2-6x+12y+15=0$ and having double its area is