by admin | September 23rd, 2010
Speed Toy
A 4 kg toy car with a speed of 10 m/s collides head-on with a stationary 1 kg car.?
(question continued) After the collision, the cars are locked together with a speed of 8.00 m/s. How much kinetic energy is lost in the collision?
KE = 1/2 mv^2
So initially; KE= 0.5*4* 10^2 = 200J
Finally; KE = 0.5*5*8^2= 160J
Energy lost = 40J via heat, sound etc
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