15. 0.5/1 points I Previous Answers SerCP11 6.P 074 Notes Ask Your Teacher A car

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15. 0.5/1 points I Previous Answers SerCP11 6.P 074 Notes Ask Your Teacher A car of mass m moving at a speed vi collides and couples with the back of a truck of mass 2m moving initially in the same direction as the car at a lower speed v2. (a) What is the speed vr of the two vehicles immediately after the collision? (Use any variable or symbol stated above as necessary.) (b) What is the change in kinetic energy of the car-truck system in the collision? (Use any variable or symbol stated above as necessary.) Need Help? Read

Explanation / Answer

change in K.E. = 0.5*3m*Vf^2 - (0.5mv1^2 + 0.5*2m*v2^2)

Change = (1.5m/9)*(v1^2+4v2^2+4v1v2) - (0.5mv1^2+mv2^2)

Change = [2mv1v2- (mv1^2+mv2^2/3)]= [-m/3(v1-v2)^2] (ans)

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