Question

1) Two cars of the same mass collide at an intersection. Justbeforethe collision one car is traveling east at 55.0 km/h and the othercar is traveling south at30.0 km/h. If the collision iscompletelyinelastic, so the two cars move as one object after thecollision,what is the speed of the cars immediately after thecollision?
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I am also stuck on this question below: I think it has the sameideaas the one above. PLEASE HELP!

2)A car with a mass of 1800 kg istraveling at a speed of 40.0 km/hon anicy road when it collides with a 10000 kg truck which wastravelingtoward the car with the speed of 18 km/h. The truck stopsmovingafter the collision. Find the change in the kinetic energy ofthesystem.
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Thanks!