The answer to this question is: C) Meteor Shower
Higher frequency,higher energy,shorter wavelength
Let the mass of 2500 kg car be
and it's velocity be
and the mass of 1500 kg car be
and it's velocity be
.
After the bumping the mass be M and it's velocity be V.
By law of conservation of momentum we have

2500 * 5 + 1500 * 1=4000 * V
V = 14000/4000 = 7/2 = 3.5 m/s
So the velocity of the two-car train = 3.5 m/s
Answer:
A conduction is the answer
Explanation:
The answer is A.
p=m/v
p= 240/60
p= 4 g/cm^3