physics
posted by Brittany .
A 3 kg toy car with a speed of 10 m/s collides headon 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?

find the velocity after collision:
3*10+2*(3)=((3+2)V
V=(306)/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.
Respond to this Question
Similar Questions

Physics
A car with a mass of 1700 kg is traveling directly northeast (45 degrees between north and east) at a speed of 14m/s (31mph), and collides with a smaller car with a mass of 1300kg that is traveling directly south at a speed of 18m/s … 
physics
A 3 kg toy car with a speed of 10 m/s collides headon with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 5.20 m/s, how much kinetic energy … 
physics
A 3 kg toy car with a speed of 10 m/s collides headon with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 5.20 m/s, how much kinetic energy … 
physics
A 3 kg toy car with a speed of 10 m/s collides headon with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 5.20 m/s, how much kinetic energy … 
physics
A green 4 kg toy car with a speed of 5 m/s collides headon with a stationary yellow 1kg car. After the collision, the cars are locked together with a speed of 4 m/s. How much kinetic energy is lost in the collision? 
physics
A car of mass 1500 kg traveling at 15.6 m/s loses its brakes and collides with the rear end of the car in front of it, which has a mass of 1020 kg and is traveling in the same direction at 12.5 m/s. If the smaller car is given a speed … 
Impulse and Momentum
A 1400kg car traveling east at 25m/s collides with a 1800kg car traveling at a speed of 20m/s in a direction that makes angle of 40degree south of west. The cars stick together after the collision. What is the magnitude and direction … 
physics
A 13 g toy car moving to the right at 22 cm/s has a headon nearly elastic collision with a 22 g toy car moving in the opposite direction at 30 cm/s. After colliding, the 13 g car moves with a velocity of 43 cm/s to the left. Find … 
Physics
At a busy intersection a 1460kg car traveling west with a speed of 12 m/s collides headon with a minivan traveling east with a speed of 9.4 m/s. The cars stick together and move with an initial velocity of 1.5 m/s to the east after … 
physics
A 5 kg toy car with a speed of 6 m/s collides headon with a stationary 1 kg car. After the collision, the cars are locked together with a speed of 5.00 m/s. How much kinetic energy is lost in the collision?