Which of the following is a fossil pteridophyte?

$A$ body moving with uniform acceleration travels a distance of $25 \ m$ in the fourth second and $37 \ m$ in the sixth second. The distance covered by the body in the next two seconds is (in $m$)

The area (in sq unit) of the region bounded by the curves $2x = y^2 - 1$ and $x = 0$ is

The eccentricity of the conic $36x^2 + 144y^2 - 36x - 96y - 119 = 0$ is

If $5x - 12y + 10 = 0$ and $12y - 5x + 16 = 0$ are two tangents to a circle,then the radius of the circle is

Two racing cars of masses $m_1$ and $m_2$ are moving in circles of radii $r_1$ and $r_2$ respectively. Their speeds are such that each makes a complete circle in the same time $t$. The ratio of the angular speeds of the first to the second car is