Question

Note: -
You are attempting question 2 out of 12
An object A moving with a speed 0.65c relative to earth and another object B moving
with a speed 0.75c relative to the object A. Calculate the speed of the object B relative to
the earth if these objects travelling in same direction.
(a) 1.000
(b) 0.20c
(c) 0.94c
(d) 0.10c​

Answer 1

Answer:

(a) 1.00 c

Explanation:

You just have let that the object A is moving with 0.65c in relative to another object which itself is moving with 0.75c relative to Earth. Please note that this speed of A is not possible according to quantum mechanics.

If both objects are moving in same direction, then speed of object B with respect to Earth will surely become 0.65c + 0.75c i.e., 1.40c

But according to Einstein, nothing can travel faster than the speed of light, 1.40 c speed isn't possible itself. Hence, the object B will appear as if to moving at the speed of light, from Earth.