Question

A 1250 kg car rams into the back of a slower moving truck having a mass of 2500 kg. During the collision the two vehicles become entangled so that they move off together afterward. If before the collision the car was going 20 m/s and the truck was going 14 m/s, what was their final velocity?

Answer 1

m1=1250 kg, m2=2500 kg,
v1=20 m/s, v2 =14 m/s.
u=?
m1•v1+m2•v2= (m1+m2)u
Solve for ‘u’

Answer 2

thank you so much!