Question

9. A rocket ship has a mass of 1.50 x 105 kg. Its relativistic momentum is 3.00 x 1012 kg•m/s. How fast is the rocket ship traveling?

 

10. How fast would a meter stick be moving so that its length will be observed to shrink to half its original length?

 

Answer 1

1.

$v=2\cdot 10^7~\frac ms.$

2.

$v=0.87c.$