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15 questions linked to/from What is the relative speed of two near-light speed particles headed towards each other?
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31 votes
6 answers
8k views

Let's say we have $2$ particles facing each other and each traveling (almost) at speed of light. Let's say I'm sitting on #$1$ particle so in my point of view #$2$ particle's speed is (almost) $c+c=2c$...
Templar's user avatar
  • 537
2 votes
1 answer
339 views

Well you know how it's said that things can't travel at or past the speed of light? However, can't they move at speeds greater than the speed of light relative to another object? For example: What ...
Gummy bears's user avatar
  • 1,622
2 votes
1 answer
304 views

Consider two particles (having same mass) moving with constant velocity very close to speed of light, say $0.99c$ in opposite directions. Will the magnitude of their relative velocities exceed the ...
Sachin's user avatar
  • 95
0 votes
2 answers
181 views

Assume 2 rockets coming towards each other at each other at 99% of speed of light, and so as they pass each other the relative velocity between 2 rockets would be 198% of Speed of Light and so what ...
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0 votes
1 answer
103 views

At school, people commonly think about momentum and conservation of energy using the example of a car collision. A common phrase is "Do not try to think of two objects moving, think of one moving at ...
Leonardo's user avatar
  • 315
0 votes
1 answer
63 views

Following scenario: Two rockets leave a planet, heading opposite direction. Assuming the rockets are capable of accelariting highly - when would there be a barrier? Einstein said, nothing can be ...
T. Smith's user avatar
  • 1
64 votes
7 answers
13k views

Let's say I fire a bus through space at (almost) the speed of light in vacuum. If I'm inside the bus (sitting on the back seat) and I run up the aisle of the bus toward the front, does that mean I'm ...
ed209's user avatar
  • 775
0 votes
2 answers
2k views

I read this question at another forum but the thread was already closed. Here's the description: Two observers A and B are both moving at a velocity of 0.9 times the speed of light with respect to a ...
Yashbhatt's user avatar
  • 1,830
1 vote
3 answers
996 views

Just a small question regarding collisions. Imagine a head-on collision between a photon and a particle with mass that moves with a non-relativistic speed, the particle was on its ground state, ...
ace7047's user avatar
  • 153
-2 votes
1 answer
648 views

Possible Duplicate: Travelling faster than the speed of light Double light speed Lets say that an airplane can fly at 4/5 of the speed of light, and I can run at 2/5 of the speed of light, and I'...
Steeven's user avatar
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2 votes
0 answers
482 views

I have just covered a very brief module on special relativity as a part of my physics course. I have also done some extra reading mostly; Morrin's Classical Mechanics. While I found the book really ...
Mark's user avatar
  • 211
0 votes
1 answer
311 views

I know this question, or similar ones have likely been asked before, but I have tried reading several, and they just don't properly explain what I'm trying to understand. The quick version of the ...
Kindar Conrath's user avatar
  • 13
4 votes
0 answers
151 views

Let's take a standard ACME Thought Experiment Division car with a max speed of a leisurely, constant 0.75c in a straight line. So, for an external observer, the body of the car behaves like a typical ...
SF.'s user avatar
  • 2,998
0 votes
1 answer
148 views

Two particles travelling with velocity .8c (observed from ground frame) each approach each other. What is their relative velocity wrt ground frame. According to me they should be added. I am very much ...
varang rai's user avatar
  • 23
0 votes
1 answer
66 views

I have the following diagram (velocities are relative to p2): and I have the following line of reasoning: The speed of P2 relative to P1 is also 0.9c Therefore P1 experiences 2 seconds of time before ...
Theo Walton's user avatar
  • 103