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What is the change in kinetic energy of the car-truck

A car of mass m moving at a speed v₁ collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v₂. (Use any variable or symbol stated above as necessary.)

(a) What is the speed v_f of the two vehicles immediately after the collision?

v_f =

(b) What is the change in kinetic energy of the car-truck system in the collision?

ΔK =

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