If the two vehicles lock together, what is is their combined velocity immediately after the collision?

Question

A 1200kg car moving at 20.5 m/s collides with a stationary car of mass 1500 kg.

Answer 1

This is a momentum problem.
It's a single object hitting another.
Assume it's a frictionless collision/road so that none of the energy dissipates for this question.
Momentum of car one ='s it's mass times it's velocity.
Momentum of car two ='s zero becuase it's not moving.
Final Velocity ='s (mass of car 1 +mass of car 2) (velocity of the locked cars)

If momentum is conserved then:
1200(20.5) + 1500(0) = 2700(v)
24600= 2700V
V= 9.11 M/s

Answer 2

It's a standard conservation of momentum problem:

m1 u1 + m2 u2 = (m1+m2) v
=> 1200 (20.5) + 1500 (0) = 2700 v
=> v = 24600 / 2700 = 9.1 m/s.

Answer 3

Cannever (1st answerer) provides the nicely suitable numbers, yet I do prefer to communicate about that: a million. it really is momentum, not potential, it quite is being calculated. and a pair of. The values given in kg are 1000's, not weights.