Homework Help: physics

Posted by Brittany on Sunday, June 26, 2011 at 9:11pm.

A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 3 m/s. If the cars are locked together after the collision with a speed of 4.80 m/s, how much kinetic energy is lost?

physics - bobpursley, Sunday, June 26, 2011 at 9:36pm
find the velocity after collision:

3*10+2*(-3)=((3+2)V

V=(30-6)/5=5m/s

KE= 1/2 m v^2=1/2 (5)(25)=75/2 Joules

What was the starting energy?
1/2 (3*100)+1/2*2*9=159Joules
check my math.

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