A body of mass 10 kg is moving with uniform velocity 20m/sec. Calculate its velocity if it enters in a black hole?
To calculate the velocity of an object entering a black hole, we need to understand the concept of escape velocity. The escape velocity is the minimum velocity required for an object to escape the gravitational field of a massive body.
In the case of a black hole, the escape velocity is greater than the speed of light, which means that nothing, including light itself, can escape from its gravitational pull. This is why a black hole is called "black," as it does not emit any visible light.
In your question, you mentioned that the body is moving with a uniform velocity of 20 m/s. This velocity is less than the speed of light but greater than the escape velocity of a black hole. Therefore, the body would be pulled into the black hole, and its velocity would continue to increase as it gets closer to the event horizon (the point of no return).
However, pinpointing the exact velocity at which the object would be moving when entering the black hole is beyond the scope of classical physics. At the event horizon, the laws of physics, including our understanding of velocity and time, break down due to the extreme gravitational effects near a black hole. We would need to rely on theories such as general relativity to make further calculations.
In summary, if an object with a uniform velocity of 20 m/s were to enter a black hole, it would be pulled in, and its velocity would continue to increase. The precise velocity at which it enters the black hole cannot be determined with classical physics alone.