Question

a 1500 kg car travelling at 16.7 m/s to the south collides with a 6300 kg truck that is initially at rest at a stop light. the car and the truck sticks togetherand moves together after the collision. what is the final velocity of the two-vehicle mass?
answer in units of m/s..
i solved and got 3.211598462 bt when i entered this answer the answer was wrong... please help..

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