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When high speed electrons hit a target

The ceiling of a hall is 40m high. For maximum horizontal distance, the angle at which the ball may be thrown with a speed of 56ms^(-1) without the ceiling of the hall is

The ceiling of a long hall is 20 m high. What is the maximum horizontal distance that a ball thrown with a speed of 40 m can go without hitting the ceiling of hall (g=10 ms^(-2)) ?

Nature And Characteristics Of High Speed Wind : Activity|OMR

In a circus a motorcyclist shows a trick of moving in a vertical plane without falling. Explain the physics of this track. What is the minimum speed of the motorcylist if the radius of the iron cage in which he shows his trick is 8 m ?