Two particles are projected with the same initial velocity, one makes an angle θ with the horizontal while the other makes an angle θ with the vertical. If their common range is R, then the product of their time of flight is directly proportional to:
1.  R
2.  $R^2$
3.  $\frac{1}{R}$
4.  $R^0$

If two projectiles, with the same masses and with the same velocities, are thrown at an angle \(60^\circ\) & \(30^\circ\) with the horizontal, then which of the following quantities will remain the same?

A particle is projected, making an angle of $\mathrm{}$\(45^{\circ}\) with the horizontal and having kinetic energy \(K\). The kinetic energy at the highest point will be: 
1. \(\frac{K}{\sqrt{2}}\)
2. \(\frac{K}{2}\)
3. \(2K\)
4. \(K\)

A particle (A) is dropped from a height and another particle (B) is projected in a horizontal direction with a speed of 5 m/s from the same height. The correct statement, from the following, is: