If $T$ is the total time of flight $h$ is the maximum height and $R$ is the range for horizontal motion, the $x$ and $y$ co-ordinates of projectile motion and time $t$ are related as 

A football is kicked with a speed of $22 \mathrm{m} {\mathrm{s}}^{-1}$ at an angle of $60°$ to the positive $x$-direction taken along the horizontal. At that instant, an observer moves past the football in a car that moves with a constant speed of $11 \mathrm{m} {\mathrm{s}}^{-1}$ in the positive $x$-direction. Take positive $y$-direction vertically upwards. $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$

Three projectiles $A, B$ and $C$ are thrown simultaneously from the same point in the same vertical plane. Their trajectories are shown in the figure. Then which of the following statement(s) is/are correct.

Two balls are thrown from an inclined plane at an angle of projection $\alpha$ with the plane one up the inclined plane and the other down the incline as shown in the figure. If $R_1$, and $R_2$ be their respective ranges, then

Two particles are projected with speed $4 \mathrm{m} {\mathrm{s}}^{-1}$ and $3 \mathrm{m} {\mathrm{s}}^{-1}$ simultaneously from same point as shown in the figure.
Then: