A 1400 kg car, heading north and moving at 35 miles per hour collides in a perfectly inelastic collision with a 4000 kg truck going East at 20 miles per hour.
- a.
- What is the speed and direction of the wrecked vehicles just after collision?
- b.
- What percentage of the total mechanical energy is lost from the collision?
Note: units are not so important here. Feel free to use kg miles/hour for momentum and 
for energy.
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