A projectile is fired horizontally from an inclined plane (of inclination $45°$ with horizontal) with speed $50 \mathrm{m} {\mathrm{s}}^{–1}.$ If $g=10 \mathrm{m} {\mathrm{s}}^{–2},$ the range measured along the incline is

If time taken by the projectile to reach $B$ is $T,$ then $AB$ is equal to

The small marble is projected with a velocity of $10 \mathrm{m} {\mathrm{s}}^{-1}$ in a direction $45°$ from the horizontal $y$-direction on the smooth inclined plane. Calculate the magnitude $v$ of its velocity after $2 \mathrm{s}$.