What happens to kinetic energy in a car collision?

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In a car collision involving a 1050kg vehicle moving at 50mph striking a stationary 1200kg vehicle, the post-collision speed of both vehicles can be calculated using conservation of momentum. The total kinetic energy before the collision is greater than after the collision, indicating energy loss. This lost kinetic energy is transformed into other forms, such as heat, sound, and deformation of the vehicles. Participants emphasize the importance of showing work and equations used in calculations to facilitate assistance. Understanding these principles is crucial for analyzing the dynamics of collisions.
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first post so here goes: this question isn't hard but i can't seem to get the answer i should have.

'a car of mass 1050kg runs into the back of car b which is stationary with mass 1200kg. car A was moving at 50mph immediately before impact. after impact, the vehicles are locked together'

calculate the speed at which the 2 vehicles move immediately after collision and the amount of kinetic energy lost in the collision. what has happened to this energy?

any help appreciated. thank you!
 
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