From an inclined palne two particles `P,Q` are projected with same speed at same angle `theta`,one up and other down the plane as shown in figure.Which of the following statement(s) is/are correct ?

On an inclined plane two particles A and B are projected with same speed at the same angle with the horizontal, particle A down and particle B up the plane. If the ratio of time of flight of A and B is cot theta , where theta is the angle at which B is projected measured from inclined plane, find the angle at which particles are projected.

On an inclined plane two particles A and B are projected with same speed at the same angle with the horizontal, particle A down and particle B up the plane. If the ratio of time of flight of A and B is cot theta , where theta is the angle at which B is projected measured from inclined plane, find the angle at which particles are projected.

Two particles are projected with speed 4 m//s and 3 m//s simultaneously from same point as shown in the figure. Then :

Two inclined frictionless tracks, one gradual and the other steep meet at a from where two stones are allowed to slide down from rest, one on each track as shown in Figure. Which of the following statement is correct ? .

Two inclined frictionless tracks, one gradual and the other steep meet at a from where two stones are allowed to slide down from rest, one on each track as shown in Figure. Which of the following statement is correct ? .

Two inclined frictionless tracks , one gradual and the other sleep meet at A from where two stones are allowed to slide down from rest. One on each track as shown in figure. Which of the following statement is correct?

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