A particle covers 50 m distance when projected with an initial speed. On the same surface it will cover a distance, when projected with double the initial speed

A particle is projected at an angle theta with an initial speed u .

A body projected along an inclined plane of angle of inclination 300 stops after covering a distance x_(1) . The same body projected with the same speed stops after covering a distance x_(2) when the angle of inclination of the inclined plane is increased to 60^(@) the ratio of x_(1)//lx_(2) is

A car covers a distance in 40 minutes with an average speed of 60 km per hour. The average speed to cover the same distance in 30 minutes is

A certain distance is covered at a certain speed . If half of this distance is covered in double the time, the ratio of the two speeds is