Afreight train rolls along a track with considerable momentum. if it rolls at the same speed but hastwice as much mass, its momentum is
a. zero. b. doubled. c. quadrupled. d. unchanged.

b. doubled

Explanation:

The momentum of an object is given by

where

m is the object's mass

v is its velocity

We see that the momentum is directly proportional to mass. Therefore if the speed of the object is unchanged, but the mass is doubled: m' = 2m, the new momentum will be

so the momentum is doubled.

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper

battery with hi vtge high val resist in series