With respect to the earth, object 1 is moving at speed 0.80 c to the right. object 2 is moving in the same direction at speed 0.80 c with respect to object 1. how fast is object 2 moving with respect to the earth?

0.976 c

Explanation:

= velocity of object 1 relative to earth = 0.80 c

= velocity of object 2 relative to object 1 = 0.80 c

= velocity of object 2 relative to earth

Velocity of object 2 relative to earth is given as

= 0.976 c

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table