- #1
TheRedDevil18
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Homework Statement
A 1200kg car traveling initially with a speed of 25m/s in an easterly direction crashes into the rear end of a 9000kg truck moving in the same direction at 20m/s. The velocity of the car right after the collision is 18m/s to the east.
3.4.1) What is the velocity of the truck after the collision
3.4.2) How much of mechanical energy is lost during the collision
Homework Equations
p=mv
ek=1/2mv^2
The Attempt at a Solution
The velocity of the truck was worked out to be 21m/s. My problem is with the second question, this is an elastic collision right ?, so their should be no mechanical energy lost ?