Question

A rocket leaves the earth at a speed of 0.6c. A second rocket leaves the first at a speed of 0.9c with respect to the first. Calculate the speed of second rocket with respect to the earth if it is fired in the same direction as the first one

Answer 1

Explanation:

Velocity of first rocket (V)= 0.6c

Velocity of second rocket with respect to first rocket(V")=0.9c

let velocity off second rocket be V'

we know that

V(a wrt b)= V a - V b

similarly

V"=V-V'

=)V'=| V - V" |

=) V'= 0.3c

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