**At what speed does a 1300 kg compact car have the same kinetic energy as a 1.8×10**^{4}**kg truck going 22 km/hr?**

**Known variables:**

**mass (m1): 1300kg**

**v2=22km/hr**

**m2= 1.8e4**

1/2mv^{2} = 1/2mv^{2}

(1300kg)(?)^{2} = (1.8e^{4})(22^{2})

(?)2=8712000/1300

**Solve for the Unknown**

(?)^{2 }= 6701.53

√6701.53

Vc= 82 km/hr

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