A ball is projected from the floor of a cabin of height 7m with speed 20 m/s at an angle of `37^(@)` with the floor of cabin. It makes a successive collision with the wall of cabin and then return again to its floor. Assume all collisions are perfectly elastic. Find time taken (in sec) by the ball to reach the floor after collisions with the ceiling of cabin.

A particle is projected from a horizontal floor with speed 10 m//s at an angle 30^(@) with the floor and striking the floor after sometime. State which is correct.

A particle is projected from a horizontal floor with speed 10(m)/(s) at an angle 30^@ with the floor and striking the floor after sometime. State which is correct.

A ball is shot in a long hall having a roof at a height of 15 cm with speed of 25 m/s at angle of 53^(@) with the floor. The ball lands on the floor at a distance shown x=____ m form the point of projection .

A ball is shot in a long hall having a roof at a height of 10m with 25m//s at an angle of 37^(@) with the floor. The ball lands on the floor at a distance of ………………….. from the point of projection. ( Assume elastic collisions if any )

A ball is projected from ground with a velocity V at an angle theta to the vertical. On its path it makes an elastic collision with a vertical wall and returns to ground. The total time of flight of the ball is

A ball is projected on a very long floor. There may be two conditions (i) floor is smooth & (ii) the collision is elastic If both the considered then the path of ball is as follows. Now if collision is inelastic and surface is rough then the path is as follows. Successive range is decreasing . Roughness of surface decreases the horizontal component of ball during collision and inelastic nature of collision decreases the vertical component of velocity of ball. In first case both components remain unchanged in magnitude and in second case both the components of the velocity will change. Let us consider a third case here surface is rough but the collision of ball with floor is elastic. A ball is projected withe speed u at an angle 30^(@) with horizontal and it is known that after collision with the floor its speed becomes (u)/(sqrt(3)) . Then answer the following questions. If the ball after first collision with the floor has rebounded vertically then the speed of the ball just after the collision with the floor would have been :

A massive vertical wall is approaching a man at a speed mu . When it is at a distance of 10m, the man throws a ball with speed 10 m/s at an angle of 37^(@) , which after having a completely elastic collision with the wall, reaches back directly into the hands of the man. The velocity of the wall is

The two balls shwonin figure are indentical the first moving at a speed v towards right and the second staying at rest. The wall at the extreme right is fixed. Assume all collisions to be elastic. Show that the speeds of the balls remain unchanged after all the collisions have taken place.

A ball is projected on a very long floor. There may be two conditions (i) floor is smooth & (ii) the collision is elastic If both the considered then the path of ball is as follows. Now if collision is inelastic and surface is rough then the path is as follows. Successive range is decreasing . Roughness of surface decreases the horizontal component of ball during collision and inelastic nature of collision decreases the vertical component of velocity of ball. In first case both components remain unchanged in magnitude and in second case both the components of the velocity will change. Let us consider a third case here surface is rough but the collision of ball with floor is elastic. A ball is projected withe speed u at an angle 30^(@) with horizontal and it is known that after collision with the floor its speed becomes (u)/(sqrt(3)) . Then answer the following questions. The angle made by the resultant velocity vector of the ball with horizontal after first collision with floor is :