Answer:
Car A has twice the energy of car B.
Explanation:
The kinetic energy of an object is given by :

Where
m is the mass
v is the speed of the object
Car A has twice the mass of Car B. Both travel at the same speed i.e.

So,

So, the kinetic energy of car A is twice of the kinetic energy of car B.
C) S waves. s waves cannot travel through liquids
ANSWER
My answer is in the photo above
D= Speed x Time
Then you convert 120km/hr to m/s depends in wich unifs you want them
120/hr to m/s it's 33.3 m/s and then 30min to seconds it's 1800
D= 33.3m/s(1800s)
D= 59940m
Yes, a puddle of water is an object in motion.